A) Create a Rot13DecoderRing class. It will have class level string variables encodedText and clearText. Add a canonicalizeString method that takes a string s, replaces all upper-case characters with the equivalent lower case character (A-> a), removes any characters in the string except characters and spaces.

2) Create a rot13Char function that converts a single lower case clear-text character into the equivalent encrypted Rot13 character. Note that modulus arithmetic means that the rot13 function both encrypts clear text characters and decrypts encoded rot13 characters add a rot13 function that accepts a string and returns a rot13 string using the rot13Char method.

This is all done with a Windows Form App in Visual Studio using C#.