NIA_Lesson_13feat: implements findPermutationDifference method to calculate permutation difference

Author: nia-source

lesson_13/maps_java/maps_app/src/main/java/com/codedifferently/lesson13/Lesson13.java

@@ -7,8 +7,15 @@ public class Lesson13 {
    * https://leetcode.com/problems/permutation-difference-between-two-strings
    */
   public int findPermutationDifference(String s, String t) {
-    return 0;
+    int answer = 0;
 
-        for (int i = 0; i < s.length(); i++) {
+    for (int i = 0; i < s.length(); i++) {
+      char ch = s.charAt(i);
+      int index = t.indexOf(ch);
+      if (index != -1) {
+        answer += Math.abs(i - index);
+      }
+      return answer;`````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
+        
+    })
   }
-}