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