write a function on python called rot13 that takes a message as a parameter and rotates all the characters by 13 places

In your main () function, prompt for a message. Call your rot13() function using that message as the parameter. Display the result and call rot13() again using the result as the parameter. Display the result of this second call, which should be the original message ( in all lower case). "Python code"

Encryption often involves the Caesar cipher-named after Julius Caesar, who used the system to encrypt military messages. Many early Internet users also adopted this cipher. Called rot13, the cipher encrypts a message by rotating the plaintext "n" becomes "a". The nice thing about rot13 is that the same function can be to encrypt and decrypt a message. Write a function called rot13 that takes a mes as a parameter and rotates all the characters by 13 places. sage