Fix syntax errors in main.py

[codegen-sh]

This PR fixes several issues in the main.py file:

1. Fixed syntax errors in the generate_manim_code() function where there were unclosed comments (lines with # at the end)
2. Moved the clean_text() function definition before it's called in the main() function for better code organization
3. Fixed spacing around the equals sign in variable assignments for consistent code style
4. Removed extra blank lines for cleaner code
5. Fixed a typo: "withouth" → "without"

These changes ensure the code will run correctly without syntax errors.

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