comefrom: <qiyuangong>389_Find_the_Difference_2.py
code: def findTheDifference( s, t):
      res = 0
      for c in s + t:
          res ^= ord(c)
      return chr(res)
masked: def sample_funcname ( var_0 , var_1 ) :
      var_3 = 0
      for var_4 in var_0 + var_1 :
          var_3 ^= ord ( var_4 )
      return chr ( var_3 )
  