comefrom: <awangdev>Sort Letters by Case_3.java
code: private void swap(char[] chars, int x, int y) {
  
          char temp = chars[x];
          chars[x] = chars[y];
          chars[y] = temp;
      }
masked: private void var_0 ( char [ ] var_1 , int var_2 , int var_3 ) {
    char var_4 = var_1 [ var_2 ] ;
    var_1 [ var_2 ] = var_1 [ var_3 ] ;
    var_1 [ var_3 ] = var_4 ;
  }
  