input: Write a function to sort a list of strings alphabetically. If the given list is empty then return the empty list as is.
  assert sort_strings(["Hello", "Yes", "No", "World"])==["Hello", "No", "World", "Yes"]
  assert sort_strings(["Apple", "Banana", "Cherry"])==["Apple", "Banana", "Cherry"]
  assert sort_strings(["Zebra", "Ant"])==["Ant", "Zebra"]
  assert sort_strings([])==[]
output: def sort_strings(lst):
      return sorted(lst)