diff --git a/.github/workflows/terraform.yml b/.github/workflows/terraform.yml
deleted file mode 100644
index 540e804..0000000
--- a/.github/workflows/terraform.yml
+++ /dev/null
@@ -1,93 +0,0 @@
-# This workflow installs the latest version of Terraform CLI and configures the Terraform CLI configuration file
-# with an API token for Terraform Cloud (app.terraform.io). On pull request events, this workflow will run
-# `terraform init`, `terraform fmt`, and `terraform plan` (speculative plan via Terraform Cloud). On push events
-# to the "main" branch, `terraform apply` will be executed.
-#
-# Documentation for `hashicorp/setup-terraform` is located here: https://github.com/hashicorp/setup-terraform
-#
-# To use this workflow, you will need to complete the following setup steps.
-#
-# 1. Create a `main.tf` file in the root of this repository with the `remote` backend and one or more resources defined.
-#   Example `main.tf`:
-#     # The configuration for the `remote` backend.
-#     terraform {
-#       backend "remote" {
-#         # The name of your Terraform Cloud organization.
-#         organization = "example-organization"
-#
-#         # The name of the Terraform Cloud workspace to store Terraform state files in.
-#         workspaces {
-#           name = "example-workspace"
-#         }
-#       }
-#     }
-#
-#     # An example resource that does nothing.
-#     resource "null_resource" "example" {
-#       triggers = {
-#         value = "A example resource that does nothing!"
-#       }
-#     }
-#
-#
-# 2. Generate a Terraform Cloud user API token and store it as a GitHub secret (e.g. TF_API_TOKEN) on this repository.
-#   Documentation:
-#     - https://www.terraform.io/docs/cloud/users-teams-organizations/api-tokens.html
-#     - https://help.github.com/en/actions/configuring-and-managing-workflows/creating-and-storing-encrypted-secrets
-#
-# 3. Reference the GitHub secret in step using the `hashicorp/setup-terraform` GitHub Action.
-#   Example:
-#     - name: Setup Terraform
-#       uses: hashicorp/setup-terraform@v1
-#       with:
-#         cli_config_credentials_token: ${{ secrets.TF_API_TOKEN }}
-
-name: 'Terraform'
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-
-permissions:
-  contents: read
-
-jobs:
-  terraform:
-    name: 'Terraform'
-    runs-on: ubuntu-latest
-    environment: production
-
-    # Use the Bash shell regardless whether the GitHub Actions runner is ubuntu-latest, macos-latest, or windows-latest
-    defaults:
-      run:
-        shell: bash
-
-    steps:
-    # Checkout the repository to the GitHub Actions runner
-    - name: Checkout
-      uses: actions/checkout@v4
-
-    # Install the latest version of Terraform CLI and configure the Terraform CLI configuration file with a Terraform Cloud user API token
-    - name: Setup Terraform
-      uses: hashicorp/setup-terraform@v1
-      with:
-        cli_config_credentials_token: ${{ secrets.TF_API_TOKEN }}
-
-    # Initialize a new or existing Terraform working directory by creating initial files, loading any remote state, downloading modules, etc.
-    - name: Terraform Init
-      run: terraform init
-
-    # Checks that all Terraform configuration files adhere to a canonical format
-    - name: Terraform Format
-      run: terraform fmt -check
-
-    # Generates an execution plan for Terraform
-    - name: Terraform Plan
-      run: terraform plan -input=false
-
-      # On push to "main", build or change infrastructure according to Terraform configuration files
-      # Note: It is recommended to set up a required "strict" status check in your repository for "Terraform Cloud". See the documentation on "strict" required status checks for more information: https://help.github.com/en/github/administering-a-repository/types-of-required-status-checks
-    - name: Terraform Apply
-      if: github.ref == 'refs/heads/"main"' && github.event_name == 'push'
-      run: terraform apply -auto-approve -input=false
diff --git a/.gitignore b/.gitignore
index 907591b..86c056e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,45 +1,2 @@
-# Prerequisites
-*.d
 
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Linker files
-*.ilk
-
-# Debugger Files
-*.pdb
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-*.smod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
-
-# debug information files
-*.dwo
-
-# Python
-__pycache__/
-*.pyc
+target/
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..13cf4d6
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,223 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "cfg-if"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
+
+[[package]]
+name = "colored"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "117725a109d387c937a1533ce01b450cbde6b88abceea8473c4d7a85853cda3c"
+dependencies = [
+ "lazy_static",
+ "windows-sys",
+]
+
+[[package]]
+name = "eijack-lab-rust"
+version = "0.1.0"
+dependencies = [
+ "colored",
+ "rand",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ff2abc00be7fca6ebc474524697ae276ad847ad0a6b3faa4bcb027e9a4614ad0"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
+[[package]]
+name = "libc"
+version = "0.2.182"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6800badb6cb2082ffd7b6a67e6125bb39f18782f793520caee8cb8846be06112"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85eae3c4ed2f50dcfe72643da4befc30deadb458a9b590d720cde2f2b1e97da9"
+dependencies = [
+ "zerocopy",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.106"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8fd00f0bb2e90d81d1044c2b32617f68fcb9fa3bb7640c23e9c748e53fb30934"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21b2ebcf727b7760c461f091f9f0f539b77b8e87f2fd88131e7f1b433b3cece4"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.117"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e665b8803e7b1d2a727f4023456bbbbe74da67099c585258af0ad9c5013b9b99"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+
+[[package]]
+name = "wasi"
+version = "0.11.1+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "zerocopy"
+version = "0.8.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a789c6e490b576db9f7e6b6d661bcc9799f7c0ac8352f56ea20193b2681532e5"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f65c489a7071a749c849713807783f70672b28094011623e200cb86dcb835953"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/__pycache__/bitcoin.cpython-312.pyc b/__pycache__/bitcoin.cpython-312.pyc
new file mode 100644
index 0000000..c4cf697
Binary files /dev/null and b/__pycache__/bitcoin.cpython-312.pyc differ
diff --git a/__pycache__/bitcoin_trading_simulation.cpython-312.pyc b/__pycache__/bitcoin_trading_simulation.cpython-312.pyc
new file mode 100644
index 0000000..77edb71
Binary files /dev/null and b/__pycache__/bitcoin_trading_simulation.cpython-312.pyc differ
diff --git a/__pycache__/test_bitcoin.cpython-312-pytest-9.0.2.pyc b/__pycache__/test_bitcoin.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..57c9363
Binary files /dev/null and b/__pycache__/test_bitcoin.cpython-312-pytest-9.0.2.pyc differ
diff --git a/__pycache__/test_bitcoin_trading.cpython-312-pytest-9.0.2.pyc b/__pycache__/test_bitcoin_trading.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..7e42478
Binary files /dev/null and b/__pycache__/test_bitcoin_trading.cpython-312-pytest-9.0.2.pyc differ
diff --git a/__pycache__/test_cli_args.cpython-312-pytest-9.0.2.pyc b/__pycache__/test_cli_args.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..75886d8
Binary files /dev/null and b/__pycache__/test_cli_args.cpython-312-pytest-9.0.2.pyc differ
diff --git a/__pycache__/test_simulation.cpython-312-pytest-9.0.2.pyc b/__pycache__/test_simulation.cpython-312-pytest-9.0.2.pyc
new file mode 100644
index 0000000..b2d17a4
Binary files /dev/null and b/__pycache__/test_simulation.cpython-312-pytest-9.0.2.pyc differ
diff --git a/bitcoin_trading_simulation.py b/bitcoin_trading_simulation.py
index cb07d20..7911477 100644
--- a/bitcoin_trading_simulation.py
+++ b/bitcoin_trading_simulation.py
@@ -142,6 +142,23 @@ def countdown(quiet=False):
     if args.no_color:
         Colors.disable()
 
+    # Input Validation
+    if args.days <= 0:
+        print(f"{Colors.FAIL}Error: Days must be a positive integer.{Colors.ENDC}", file=sys.stderr)
+        sys.exit(1)
+
+    if args.initial_cash <= 0:
+        print(f"{Colors.FAIL}Error: Initial cash must be greater than 0.{Colors.ENDC}", file=sys.stderr)
+        sys.exit(1)
+
+    if args.initial_price <= 0:
+        print(f"{Colors.FAIL}Error: Initial price must be greater than 0.{Colors.ENDC}", file=sys.stderr)
+        sys.exit(1)
+
+    if args.volatility < 0:
+        print(f"{Colors.FAIL}Error: Volatility must be non-negative.{Colors.ENDC}", file=sys.stderr)
+        sys.exit(1)
+
     # Simulate prices
     prices = simulate_bitcoin_prices(days=args.days, initial_price=args.initial_price, volatility=args.volatility)
 
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..a3e978a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1 @@
+fn main() { println!("Hello, world!"); }
diff --git a/target/.rustc_info.json b/target/.rustc_info.json
new file mode 100644
index 0000000..747eff8
--- /dev/null
+++ b/target/.rustc_info.json
@@ -0,0 +1 @@
+{"rustc_fingerprint":11990908473491073401,"outputs":{"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/jules/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.92.0 (ded5c06cf 2025-12-08)\nbinary: rustc\ncommit-hash: ded5c06cf21d2b93bffd5d884aa6e96934ee4234\ncommit-date: 2025-12-08\nhost: x86_64-unknown-linux-gnu\nrelease: 1.92.0\nLLVM version: 21.1.3\n","stderr":""}},"successes":{}}
\ No newline at end of file
diff --git a/target/CACHEDIR.TAG b/target/CACHEDIR.TAG
new file mode 100644
index 0000000..20d7c31
--- /dev/null
+++ b/target/CACHEDIR.TAG
@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/
diff --git a/target/debug/.cargo-lock b/target/debug/.cargo-lock
new file mode 100644
index 0000000..e69de29
diff --git a/target/debug/.fingerprint/cfg-if-2d20780be38939e6/dep-lib-cfg_if b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/dep-lib-cfg_if
new file mode 100644
index 0000000..ec3cb8b
Binary files /dev/null and b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/dep-lib-cfg_if differ
diff --git a/target/debug/.fingerprint/cfg-if-2d20780be38939e6/invoked.timestamp b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if
new file mode 100644
index 0000000..117f269
--- /dev/null
+++ b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if
@@ -0,0 +1 @@
+fb18494944273c29
\ No newline at end of file
diff --git a/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if.json b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if.json
new file mode 100644
index 0000000..1156ac1
--- /dev/null
+++ b/target/debug/.fingerprint/cfg-if-2d20780be38939e6/lib-cfg_if.json
@@ -0,0 +1 @@
+{"rustc":4758242423518056681,"features":"[]","declared_features":"[\"core\", \"rustc-dep-of-std\"]","target":13840298032947503755,"profile":15657897354478470176,"path":828088505969299709,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/cfg-if-2d20780be38939e6/dep-lib-cfg_if","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/colored-0832305205b4f75d/dep-lib-colored b/target/debug/.fingerprint/colored-0832305205b4f75d/dep-lib-colored
new file mode 100644
index 0000000..ec3cb8b
Binary files /dev/null and b/target/debug/.fingerprint/colored-0832305205b4f75d/dep-lib-colored differ
diff --git a/target/debug/.fingerprint/colored-0832305205b4f75d/invoked.timestamp b/target/debug/.fingerprint/colored-0832305205b4f75d/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/target/debug/.fingerprint/colored-0832305205b4f75d/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored b/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored
new file mode 100644
index 0000000..a072ffb
--- /dev/null
+++ b/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored
@@ -0,0 +1 @@
+352ba7ccf97bd44e
\ No newline at end of file
diff --git a/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored.json b/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored.json
new file mode 100644
index 0000000..04b0add
--- /dev/null
+++ b/target/debug/.fingerprint/colored-0832305205b4f75d/lib-colored.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy b/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy
new file mode 100644
index 0000000..95fd8ce
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy
@@ -0,0 +1 @@
+6b6a4673998b5656
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy.json b/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy.json
new file mode 100644
index 0000000..7ad8a87
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-0c726811dd96422b/lib-zerocopy.json
@@ -0,0 +1 @@
+{"rustc":4758242423518056681,"features":"[\"simd\"]","declared_features":"[\"__internal_use_only_features_that_work_on_stable\", \"alloc\", \"derive\", \"float-nightly\", \"simd\", \"simd-nightly\", \"std\", \"zerocopy-derive\"]","target":3084901215544504908,"profile":15657897354478470176,"path":9721087258936554607,"deps":[[17375358419629610217,"build_script_build",false,7447620231246918782]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/zerocopy-0c726811dd96422b/dep-lib-zerocopy","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build b/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build
new file mode 100644
index 0000000..19b75c1
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build
@@ -0,0 +1 @@
+7e347c2124435b67
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build.json b/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build.json
new file mode 100644
index 0000000..7b81793
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-30c85b0c603db08e/run-build-script-build-script-build.json
@@ -0,0 +1 @@
+{"rustc":4758242423518056681,"features":"","declared_features":"","target":0,"profile":0,"path":0,"deps":[[17375358419629610217,"build_script_build",false,17805900089940872276]],"local":[{"RerunIfChanged":{"output":"debug/build/zerocopy-30c85b0c603db08e/output","paths":["build.rs","Cargo.toml"]}}],"rustflags":[],"config":0,"compile_kind":0}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build
new file mode 100644
index 0000000..b46addd
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build
@@ -0,0 +1 @@
+548c05c7ca431bf7
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build.json b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build.json
new file mode 100644
index 0000000..ed60d76
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/build-script-build-script-build.json
@@ -0,0 +1 @@
+{"rustc":4758242423518056681,"features":"[\"simd\"]","declared_features":"[\"__internal_use_only_features_that_work_on_stable\", \"alloc\", \"derive\", \"float-nightly\", \"simd\", \"simd-nightly\", \"std\", \"zerocopy-derive\"]","target":5408242616063297496,"profile":2225463790103693989,"path":3740372662056961748,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/dep-build-script-build-script-build","checksum":false}}],"rustflags":[],"config":2069994364910194474,"compile_kind":0}
\ No newline at end of file
diff --git a/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/dep-build-script-build-script-build b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/dep-build-script-build-script-build
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diff --git a/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/invoked.timestamp b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/target/debug/.fingerprint/zerocopy-88913a0a0ea1f7ec/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
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diff --git a/target/debug/build/libc-db946e1a6607099d/invoked.timestamp b/target/debug/build/libc-db946e1a6607099d/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/target/debug/build/libc-db946e1a6607099d/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/target/debug/build/libc-db946e1a6607099d/output b/target/debug/build/libc-db946e1a6607099d/output
new file mode 100644
index 0000000..89a43b5
--- /dev/null
+++ b/target/debug/build/libc-db946e1a6607099d/output
@@ -0,0 +1,25 @@
+cargo:rerun-if-changed=build.rs
+cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_FREEBSD_VERSION
+cargo:rustc-cfg=freebsd12
+cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_MUSL_V1_2_3
+cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_LINUX_TIME_BITS64
+cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_GNU_FILE_OFFSET_BITS
+cargo:rerun-if-env-changed=RUST_LIBC_UNSTABLE_GNU_TIME_BITS
+cargo:rustc-check-cfg=cfg(emscripten_old_stat_abi)
+cargo:rustc-check-cfg=cfg(espidf_time32)
+cargo:rustc-check-cfg=cfg(freebsd10)
+cargo:rustc-check-cfg=cfg(freebsd11)
+cargo:rustc-check-cfg=cfg(freebsd12)
+cargo:rustc-check-cfg=cfg(freebsd13)
+cargo:rustc-check-cfg=cfg(freebsd14)
+cargo:rustc-check-cfg=cfg(freebsd15)
+cargo:rustc-check-cfg=cfg(gnu_file_offset_bits64)
+cargo:rustc-check-cfg=cfg(gnu_time_bits64)
+cargo:rustc-check-cfg=cfg(libc_deny_warnings)
+cargo:rustc-check-cfg=cfg(linux_time_bits64)
+cargo:rustc-check-cfg=cfg(musl_v1_2_3)
+cargo:rustc-check-cfg=cfg(musl32_time64)
+cargo:rustc-check-cfg=cfg(vxworks_lt_25_09)
+cargo:rustc-check-cfg=cfg(target_os,values("switch","aix","ohos","hurd","rtems","visionos","nuttx","cygwin","qurt"))
+cargo:rustc-check-cfg=cfg(target_env,values("illumos","wasi","aix","ohos","nto71_iosock","nto80"))
+cargo:rustc-check-cfg=cfg(target_arch,values("loongarch64","mips32r6","mips64r6","csky"))
diff --git a/target/debug/build/libc-db946e1a6607099d/root-output b/target/debug/build/libc-db946e1a6607099d/root-output
new file mode 100644
index 0000000..afe4d54
--- /dev/null
+++ b/target/debug/build/libc-db946e1a6607099d/root-output
@@ -0,0 +1 @@
+/app/target/debug/build/libc-db946e1a6607099d/out
\ No newline at end of file
diff --git a/target/debug/build/libc-db946e1a6607099d/stderr b/target/debug/build/libc-db946e1a6607099d/stderr
new file mode 100644
index 0000000..e69de29
diff --git a/target/debug/build/zerocopy-30c85b0c603db08e/invoked.timestamp b/target/debug/build/zerocopy-30c85b0c603db08e/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/target/debug/build/zerocopy-30c85b0c603db08e/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/target/debug/build/zerocopy-30c85b0c603db08e/output b/target/debug/build/zerocopy-30c85b0c603db08e/output
new file mode 100644
index 0000000..deda5f6
--- /dev/null
+++ b/target/debug/build/zerocopy-30c85b0c603db08e/output
@@ -0,0 +1,21 @@
+cargo:rerun-if-changed=build.rs
+cargo:rerun-if-changed=Cargo.toml
+cargo:rustc-check-cfg=cfg(no_zerocopy_simd_x86_avx12_1_89_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.89.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_core_error_1_81_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.81.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_diagnostic_on_unimplemented_1_78_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.78.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_generic_bounds_in_const_fn_1_61_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.61.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_target_has_atomics_1_60_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.60.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_aarch64_simd_1_59_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.59.0"))
+cargo:rustc-check-cfg=cfg(no_zerocopy_panic_in_const_and_vec_try_reserve_1_57_0)
+cargo:rustc-check-cfg=cfg(rust, values("1.57.0"))
+cargo:rustc-check-cfg=cfg(doc_cfg)
+cargo:rustc-check-cfg=cfg(kani)
+cargo:rustc-check-cfg=cfg(__ZEROCOPY_INTERNAL_USE_ONLY_NIGHTLY_FEATURES_IN_TESTS)
+cargo:rustc-check-cfg=cfg(__ZEROCOPY_INTERNAL_USE_ONLY_DEV_MODE)
+cargo:rustc-check-cfg=cfg(coverage_nightly)
diff --git a/target/debug/build/zerocopy-30c85b0c603db08e/root-output b/target/debug/build/zerocopy-30c85b0c603db08e/root-output
new file mode 100644
index 0000000..7559a80
--- /dev/null
+++ b/target/debug/build/zerocopy-30c85b0c603db08e/root-output
@@ -0,0 +1 @@
+/app/target/debug/build/zerocopy-30c85b0c603db08e/out
\ No newline at end of file
diff --git a/target/debug/build/zerocopy-30c85b0c603db08e/stderr b/target/debug/build/zerocopy-30c85b0c603db08e/stderr
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diff --git a/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv-0j9dye9parlitnbkrjdze8d5r/query-cache.bin b/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv-0j9dye9parlitnbkrjdze8d5r/query-cache.bin
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diff --git a/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv-0j9dye9parlitnbkrjdze8d5r/work-products.bin b/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv-0j9dye9parlitnbkrjdze8d5r/work-products.bin
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diff --git a/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv.lock b/target/debug/incremental/eijack_lab_rust-11rbgacjp2asi/s-hg6wrjagcr-0bc3gcv.lock
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diff --git a/test_cli_args.py b/test_cli_args.py
new file mode 100644
index 0000000..3acb4b1
--- /dev/null
+++ b/test_cli_args.py
@@ -0,0 +1,58 @@
+import sys
+import subprocess
+import pytest
+
+def run_simulation(args):
+    """
+    Helper function to run the simulation script as a subprocess.
+    """
+    cmd = [sys.executable, "bitcoin_trading_simulation.py"] + args
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    return result
+
+def test_cli_invalid_days():
+    """Test that non-positive days results in error."""
+    result = run_simulation(["--days", "-5"])
+    assert result.returncode == 1
+    assert "Error: Days must be a positive integer." in result.stderr
+
+    result = run_simulation(["--days", "0"])
+    assert result.returncode == 1
+    assert "Error: Days must be a positive integer." in result.stderr
+
+def test_cli_invalid_initial_cash():
+    """Test that non-positive initial cash results in error."""
+    result = run_simulation(["--initial-cash", "-1000"])
+    assert result.returncode == 1
+    assert "Error: Initial cash must be greater than 0." in result.stderr
+
+    result = run_simulation(["--initial-cash", "0"])
+    assert result.returncode == 1
+    assert "Error: Initial cash must be greater than 0." in result.stderr
+
+def test_cli_invalid_initial_price():
+    """Test that non-positive initial price results in error."""
+    result = run_simulation(["--initial-price", "-500"])
+    assert result.returncode == 1
+    assert "Error: Initial price must be greater than 0." in result.stderr
+
+def test_cli_invalid_volatility():
+    """Test that negative volatility results in error."""
+    result = run_simulation(["--volatility", "-0.1"])
+    assert result.returncode == 1
+    assert "Error: Volatility must be non-negative." in result.stderr
+
+def test_cli_valid_args():
+    """Test that valid arguments run successfully."""
+    # Run with small days to keep test fast
+    result = run_simulation(["--days", "5", "--quiet"])
+    assert result.returncode == 0
+    assert "Final Portfolio Performance" in result.stdout
+
+def test_cli_no_color_error():
+    """Test that error messages respect --no-color flag (no ANSI codes)."""
+    result = run_simulation(["--days", "-5", "--no-color"])
+    assert result.returncode == 1
+    # Check that the ANSI fail code is NOT in the output
+    assert "\033[91m" not in result.stderr
+    assert "Error: Days must be a positive integer." in result.stderr