input: Write a function to print a list of strings in alphabetical order. The function takes a list of strings as input and prints each string in the sorted order. If the input list is empty, the function should not print anything.
  assert print_alphabetical_order(['cat', 'dog', 'apple', 'banana'])==None
  assert print_alphabetical_order([])==None
output: def print_alphabetical_order(strings):
      if strings:
          for s in sorted(strings):
              print(s)