input: Write a function to sort a list of strings alphabetically. If the list is empty, return an empty list. The function should take a list of strings as input and return the sorted list of strings.
  assert sort_strings(["Hello", "Yes", "No", "World"])==["Hello", "No", "World", "Yes"]
  assert sort_strings(["Apple", "Banana", "Cherry", "Date"])==["Apple", "Banana", "Cherry", "Date"]
  assert sort_strings([])==[]
  assert sort_strings(["Zebra", "Aardvark", "Lion", "Tiger"])==["Aardvark", "Lion", "Tiger", "Zebra"]
output: def sort_strings(lst):
      return sorted(lst)