slight format change

Crypto/src/ROT13.java

@@ -1,9 +1,8 @@
 import java.util.*;
 
 public class ROT13  {
-    int shift;
-    Map<Character, Character> cypher;
-    String alphabet = "abcdefghijklmnopqrstuvwxyz";
+    private int shift;
+    private Map<Character, Character> cypher = new HashMap<>();
 
     ROT13(Character cs, Character cf) {
         shift = Math.abs((int)cs - (int)cf);
@@ -16,28 +15,25 @@ public class ROT13  {
     }
 
     public void setupHM() {
-        cypher = new HashMap<>();
+        String alphabet = "abcdefghijklmnopqrstuvwxyz";
+
         for(Character c : alphabet.toCharArray()) {
             int offset = (int)c + shift > 122 ? (int)c - shift : (int)c  + shift;
             cypher.put(c, (char)offset);
         }
     }
 
-
     public String crypt(String text) throws UnsupportedOperationException {
         StringBuilder result = new StringBuilder();
 
         for(Character c : text.toCharArray()) {
             if (Character.isLetter(c)) {
                 if (Character.isUpperCase(c)) {
-                    //get the cyphered lowercase char then add it to the result as uppercase.
                     result.append(Character.toUpperCase(cypher.get(Character.toLowerCase(c))));
                 }
                 else result.append(cypher.get(c));
             }
-            else {
-                result.append(c);
-            }
+            else result.append(c);
         }
         return result.toString();
     }
@@ -51,13 +47,7 @@ public class ROT13  {
     }
 
     public static String rotate(String s, Character c) {
-        String[] rotator = s.split("");
-        StringBuilder result = new StringBuilder();
-
-        for(int i = 0; i < rotator.length; i++) {
-            result.append(rotator[(s.indexOf(c) + i) % rotator.length]);
-        }
-        return result.toString();
+        return s.substring(s.indexOf(c)) + s.substring(0, s.indexOf(c));
     }
 
 }