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