comefrom: <awangdev>151. Reverse Words in a String_4.java
code: private void reverse(char[] arr, int i, int j) {
  
          while (i < j) {
              char temp = arr[i];
              arr[i++] = arr[j];
              arr[j--] = temp;
          }
      }
masked: private void var_0 ( char [ ] var_1 , int var_2 , int var_3 ) {
    while ( var_2 < var_3 ) {
      char var_4 = var_1 [ var_2 ] ;
      var_1 [ var_2 ++ ] = var_1 [ var_3 ] ;
      var_1 [ var_3 -- ] = var_4 ;
    }
  }
  