comefrom: <gouthampradhan>math_AddDigits_1.java
code: public int addDigits(int num) {
      if (num == 0) return 0;
      return num % 9 == 0 ? 9 : num % 9;
    }
masked: public int sample_funcname ( int var_0 ) {
    if ( var_0 == 0 ) return 0 ;
    return var_0 % 9 == 0 ? 9 : var_0 % 9 ;
  }
  