Refactor codebase for better readability and maintainability

[RyanKatayi]

• Refactored the main functions by breaking down complex logic into smaller, more manageable functions.
• Consolidated repetitive code blocks, particularly for CSV file handling.
• Added a consistent method for displaying messages to users.
• Implemented a 2-second delay for user messages to enhance UX.
• Improved input validation and error handling for better reliability.
• Organized the code structure for better clarity and maintainability.