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