comefrom: <awangdev>387. First Unique Character in a String_2.java
code: public int firstUniqChar(String s) {
          if (s == null || s.length() == 0) return -1;
          for (int i = 0; i < s.length(); i++) {
              if (s.indexOf(s.charAt(i)) == s.lastIndexOf(s.charAt(i))) {
                  return i;
              }
          }
          return -1;
      }
masked: public int sample_funcname ( String var_1 ) {
    if ( var_1 == null || var_1 . length ( ) == 0 ) return - 1 ;
    for ( int var_6 = 0 ;
    var_6 < var_1 . length ( ) ;
    var_6 ++ ) {
      if ( var_1 . indexOf ( var_1 . charAt ( var_6 ) ) == var_1 . lastIndexOf ( var_1 . charAt ( var_6 ) ) ) {
        return var_6 ;
      }
    }
    return - 1 ;
  }
  