input: Write a function to print a list of strings in alphabetical order.
  def sort_strings(string_list):
      string_list.sort()
      for string in string_list:
          print(string)
  assert sort_strings(['cat', 'dog', 'apple', 'banana']) == None
  assert sort_strings(['zebra', 'elephant', 'ant']) == None
  assert sort_strings([]) == None
output: def sort_strings(string_list):
      string_list.sort()
      for string in string_list:
          print(string)