comefrom: <awangdev>1216. Valid Palindrome III_2.java
code: private String getKey(int left, int right, int k) {
  
          return String.format("%s@%s@%s", left, right, k);
      }
masked: private String var_0 ( int var_1 , int var_2 , int var_3 ) {
    return String . format ( "%s@%s@%s" , var_1 , var_2 , var_3 ) ;
  }
  