Unit 4 Hw - Ceasar Cipher

public class caesarCipher {

    public static String crack (String message) {
      String crack = "";
      for (int i = 0; i<message.length(); i++) {
        if (message.charAt(i) < 'a' || message.charAt(i) > 'z') {
          crack += message.charAt(i);
          continue;
        }
        int letter = message.charAt(i)-'a';
        int new_letter = (letter-4)%26;
        crack += (char)(new_letter+'a');
      }
      return crack;
    }
  
    public static void main(String[] args) {
  
        String message1 = "xli yrmxih wxexiw sj eqivmge";
        System.out.println(crack(message1));
  
        
        String message2 = "xli xlmvxiir gspsrmiw";
        System.out.println(crack(message2));
  
        String message3 = "i tpyvmfyw yryq, rszyw svhs wigpsvyq";
        System.out.println(crack(message3));
        

    }
  }
  
  caesarCipher.main(null);

the united states of america
the thirteen colonies
e pluribus unum, novus ordo seclorum