Refactor Token Parsing and Parameter Extraction Logic for Improved Clarity

[LunaStev]

• Refactored parameter parsing logic: Replaced direct push with match arms to handle different cases and continue on default.
• Refined initial value extraction logic by replacing index-based lookups with token stream handling using peek and next methods.
• Optimized token iteration by replacing while loop with while let and match, improving readability and token handling.
• Simplified code by removing unnecessary index tracking, eliminating the let mut i = 0; initialization.
• Refactored the extract_parameters function to accept a mutable Peekable iterator, replacing the previous token slice approach.
• Added necessary imports: Included Peekable from std::iter and Iter from std::.slice for token iteration.
• Implemented the parse_function function to parse function definitions from tokens, extracting the function name, parameters, and body.
• Replaced direct calls to extract_parameters with the updated version that accepts a mutable Peekable iterator.