comefrom: <awangdev>771. Jewels and Stones_1.java
code: public int numJewelsInStones(String J, String S) {
          if (J == null || J.length() == 0 || S == null || S.length() == 0) {
              return 0;
          }
          int m = J.length();
          Set<Character> set = new HashSet<>();
          int count = 0;
          for (char c : J.toCharArray()) {
              set.add(c);
          }
          for (char c : S.toCharArray()) {
              count += set.contains(c) ? 1 : 0;
          }
          return count;
      }
masked: public int sample_funcname ( String var_1 , String var_2 ) {
    if ( var_1 == null || var_1 . length ( ) == 0 || var_2 == null || var_2 . length ( ) == 0 ) {
      return 0 ;
    }
    int var_6 = var_1 . length ( ) ;
    Set < Character > var_10 = new HashSet < > ( ) ;
    int var_11 = 0 ;
    for ( char var_13 : var_1 . toCharArray ( ) ) {
      var_10 . add ( var_13 ) ;
    }
    for ( char var_13 : var_2 . toCharArray ( ) ) {
      var_11 += var_10 . contains ( var_13 ) ? 1 : 0 ;
    }
    return var_11 ;
  }
  