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-> I create the shift_char func. to handle the shifting of invidual chars, making the code more modular and readable.
-> Now code can encrypt and decrypt digits.
-> Modified the decode function to iterate through all possible keys (0 to 25) and print the decrypted messages for each key.
-> New input validation for the key input to ensure it is an int (1-25)
-> User's choice converted to lowercase for case-insensitive comparing.