Refactor: Improve code readability and consistency in Snake Game

[Krishnnavadiya]

This pull request refactors the Snake Game project to enhance code readability, maintainability, and overall structure.

Changes Made

• Refactored code across snake.h, main.cpp, and snake_test.cpp for improved clarity and consistency.
• Streamlined input handling, rendering, and game loop logic.
• Ensured a more organized and maintainable codebase without affecting functionality.