public static string Decode(string cipheredText)
{
cipher = new MyAtbashCipher();
return(string.Concat(cipheredText
.ToLower()
.Where(char.IsLetterOrDigit)
.Select(l => char.IsLetter(l) ? cipher.Decode(l) : l)));
}
public static string Encode(string plainText)
{
cipher = new MyAtbashCipher();
var cipherText = string.Concat(plainText
.ToLower()
.Where(char.IsLetterOrDigit)
.Select(l => char.IsLetter(l) ? cipher.Encode(l) : l));
return(string.Concat(GroupCipheredText(cipherText, ' ', 5)));
}