Release v2.0

Changes made:

1. Updated Jquery to v3.7
2. Converted var declarations to const and let where appropriate.
3. Simplify the structure by removing unnecessary nesting.
4. Replaced repetitive patterns with switch statements for cleaner code.
5. Refactored validation functions for better readability and maintainability.
6. Standardized error messages and variable names for consistency.
7. Added comments to explain the functionality of different sections.
8. Ensured consistent use of single quotes for string literals.
9. Removed unused variables and optimized variable declarations.
10. Made the code more modular by separating functions for different tasks.
11. Ensured the use of strict equality (===) where appropriate.
12. Improved error handling and validation logic.