comefrom: <awangdev>557. Reverse Words in a String III_1.java
code: public void reverse(char[] s, int start, int end) {
          while (start < end) {
              char temp = s[start];
              s[start] = s[end];
              s[end] = temp;
              start++;
              end--;
          }
      }
masked: public 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 ;
      var_2 ++ ;
      var_3 -- ;
    }
  }
  