Rot13
Rot-13 - this rotate 13 characters in the alphabet and wrap back around."abcdefghijklmnopqrstuvwxyz"
"cat"
"png" - encrypted using rot13
Implement the ability to read in the contents of a file, encrypt it using rot13, then write the encrypted version to a new file called encrypt.txt. You should be able to test the accuracy, by copying the contents of encrypt.txt into your source file and running encrypt again and see you original message in encrypt.txt.
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