input: Write a python function to sort strings by length in a list.
  assert sort_strings_by_length(["apple", "pear", "banana", "kiwi", "cherry"]) == ["kiwi", "pear", "apple", "cherry", "banana"]
  assert sort_strings_by_length(["elephant", "dog", "cat", "hippopotamus", "bee"]) == ["bee", "dog", "cat", "elephant", "hippopotamus"]
  assert sort_strings_by_length(["a", "bb", "ccc", "dddd"]) == ["a", "bb", "ccc", "dddd"]
output: def sort_strings_by_length(strings):
      return sorted(strings, key=len)