comefrom: <awangdev>796. Rotate String_2.java
code: public void reverse(char[] A, int start, int end) {
          for (int i = start, j = end; i < j; i++, j--) {
              char temp = A[j];
              A[j] = A[i];
              A[i] = temp;
          }
      }
masked: public void var_0 ( char [ ] var_1 , int var_2 , int var_3 ) {
    for ( int var_4 = var_2 , var_5 = var_3 ;
    var_4 < var_5 ;
    var_4 ++ , var_5 -- ) {
      char var_6 = var_1 [ var_5 ] ;
      var_1 [ var_5 ] = var_1 [ var_4 ] ;
      var_1 [ var_4 ] = var_6 ;
    }
  }
  