Refactor Web3Wrapper and optimize string/array operations

[Kushmanmb]

Summary

Improves code quality, readability, and performance across several core components of the MEWconnect iOS app. This PR focuses on refactoring repeated code patterns, optimizing string/array operations, and modernizing project configuration files.

🎯 Motivation

• Reduce code duplication in Web3Wrapper cryptographic operations
• Improve performance of string processing operations (from O(n²) to O(n))
• Modernize Git configuration for better iOS/Swift development workflow
• Eliminate unsafe force unwrapping where possible

📝 Changes

🔧 Refactoring (Web3Wrapper. swift)

Problem: Keydata decryption logic was duplicated across 3 methods
Solution: Extracted into reusable helper methods

• obtainDecryptedKeydata(): Centralized repeated 2-line decryption pattern
• createBIP32Keystore(): Static helper for BIP32 keystore creation
• Removed force unwrapping (!) operators for safer optional handling
• Cleaner method signatures: Eliminated unnecessary optional chaining

Impact:

• 🔒 More maintainable cryptographic code
• 🐛 Reduced risk of nil-pointer crashes
• 📖 Improved code readability

---

⚡ Performance Optimizations

Character+ASCIIValue. swift

Before: Created intermediate String object
After: Direct unicode scalar access

// Before: O(n) + String allocation
let s = String(self).unicodeScalars
return s[s.startIndex]. value

// After: O(1) + zero allocations
return self.unicodeScalars. first!.value

[Kushmanmb]

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[Kushmanmb]

Kmmb

[Kushmanmb]

[Kushmanmb]

[Kushmanmb]

great work