Caesar Cipher function

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Caesar Cipher function.

• takes two inputs, a string for the message, and an integer for the shift
• returns a string that's just the input string with all of its characters shifted by the amount specified in the shift argument
• for each character in the string (including punctuation marks, special characters and capital letters) gets that character's Unicode v, and replaces it by the character with the Unicode v + shift
• accounts for user inputs that aren't strings
• is as elegant and efficient as possible