input: Write a function to reverse the combined result of two strings by concatenating them first and then applying a reverse operation. The function should return the reversed string.
  
  def reverse_combined_strings(string1, string2):
      combined = string1 + string2
      result = combined[::-1]
      return result
  
  assert reverse_combined_strings("Hello ", "world!") == "!dlrow olleH"
  assert reverse_combined_strings("Python", " Java") == "avaJ nohtyP"
  assert reverse_combined_strings("", "empty") == "ytpmE"
  assert reverse_combined_strings("Short ", "String") == "gnirtS trohS"
output: def reverse_combined_strings(string1, string2):
      combined = string1 + string2
      result = combined[::-1]
      return result