input: 
  def reverse_combined_strings(s1: str, s2: str) -> str:
      """ Combines two given strings and returns the reversed result of the combined string.
      >>> reverse_combined_strings("Hello ", "world!")
      '!dlrow olleH'
      >>> reverse_combined_strings("Python", " code")
      'edoc nohtyP'
      """
  
output:     combined = s1 + s2
      return combined[::-1]