input: Write a function to sort a list of strings based on their length and return the sorted list. If the input list is empty, the function should return an empty list.
  assert sort_strings_by_length(["Hello", "World!", "Good", "Morning"]) == ["Good", "Hello", "World!", "Morning"]
  assert sort_strings_by_length([]) == []
output: def sort_strings_by_length(strings):
      return sorted(strings, key=len)