input: Write a function to take a list of strings as input and print the strings in alphabetical order.
  
  def sort_and_print_strings(strings):
      if strings is None:
          return
      strings.sort()
      for string in strings:
          print(string)
  
  assert sort_and_print_strings(['cat', 'dog', 'apple', 'banana'])==None
  assert sort_and_print_strings(['zebra', 'ant', 'bee'])==None
  assert sort_and_print_strings([])==None
  assert sort_and_print_strings(None)==None
output: def sort_and_print_strings(strings):
      if strings is None:
          return
      strings.sort()
      for string in strings:
          print(string)