private string RicardoCipher(string value, int shift)
char[] buffer = value.ToCharArray();
for (int i = 0; i < buffer.Length; i++)
if (Char.IsLetter(letter))
bool isLower = Char.IsLower(letter);
letter = (char)(letter + shift);
letter = (char) (letter - 26);
letter = (char) (letter + 26);
letter = (char)(letter - 26);
letter = (char)(letter + 26);
return new string(buffer);
string ricardoNotSecretMessage = RicardoCipher(RicardoSecretString(), 18);
Console.WriteLine(ricardoNotSecretMessage);
public string RicardoSecretString(){
string ricardoSecretText = @"AMKZMB UMAAIOM
Vwe qa bpm bqum nwz itt owwl lmaqovmza bw kwum bw bpm iql wn bpmqz ktqmvba
return ricardoSecretText;