input: Write a function to sort a list of strings based on their length. The function should take a list of strings as input and return the sorted list.
  
  assert sort_strings_by_length(["Hello","World!","Good","Morning"])==["Good","Hello","World!","Morning"]
  assert sort_strings_by_length(["Python","is","amazing"])==["is","Python","amazing"]
  assert sort_strings_by_length(["Short","List","Example"])==["List","Short","Example"]
  assert sort_strings_by_length([])==[]
output: def sort_strings_by_length(strings):
      return sorted(strings, key=len)