Fixed Caesar Cipher Implementation

[imShreya2007]

Changes Made

Fixed Caesar Cipher Implementation

• Renamed class: Updated class name for better code clarity and convention
• Added reverse key mapping: Implemented rev_key dictionary for proper decryption functionality
• Fixed encrypt/decrypt behavior: Corrected the encryption and decryption logic to work bidirectionally
• Code refactoring: Improved code structure and removed redundant lines (32 insertions, 34 deletions)
• Updated README example: Fixed terminology and examples to match the corrected implementation

Technical Details

• The cipher now properly creates a reverse mapping for decryption
• Both encryption and decryption functions work correctly with the ROT3 Caesar cipher
• Input validation remains intact for alphabetic characters only

Testing

• ✅ Encryption works correctly
• ✅ Decryption properly reverses encrypted text
• ✅ Input validation prevents invalid characters