input: Write a python function to determine if a number is an integer or a float and return a corresponding message.
  assert check_number_type(100) == "It is an integer"
  assert check_number_type(100.0) == "It is a float"
  assert check_number_type(0.5) == "It is a float"
output: def check_number_type(number):
      if isinstance(number, int):
          return "It is an integer"
      elif isinstance(number, float):
          return "It is a float"