input: Write a python function to sort a list of strings in alphabetical order.
  assert sort_string_list(['cat', 'dog', 'apple', 'zebra']) == ['apple', 'cat', 'dog', 'zebra']
  assert sort_string_list(['banana', 'apple', 'cherry']) == ['apple', 'banana', 'cherry']
  assert sort_string_list(['blue', 'red', 'yellow', 'green']) == ['blue', 'green', 'red', 'yellow']
output: def sort_string_list(strings):
      return sorted(strings)