input: Write a function to take a list of strings as input and print the strings in alphabetical order. If the input list is empty, print a message indicating the list is empty.
  assert sort_strings(['cat', 'dog', 'apple', 'banana'])==None
  def sort_strings(strings):
      if not strings:
          print("The list is empty.")
      else:
          strings.sort()
          for string in strings:
              print(string)
  assert sort_strings([])==None
output: def sort_strings(strings):
      if not strings:
          print("The list is empty.")
      else:
          strings.sort()
          for string in strings:
              print(string)