input: Write a function to sort a list of strings alphabetically.
  
  def sort_strings(strings):
      strings.sort()
      return strings
  
  assert sort_strings(["Hello", "Yes", "No", "World"])==["Hello", "No", "World", "Yes"]
  assert sort_strings(["apple", "banana", "cherry"])==["apple", "banana", "cherry"]
  assert sort_strings(["zoo", "zebra", "ant"])==["ant", "zebra", "zoo"]
  assert sort_strings([])==[]
output: def sort_strings(strings):
      strings.sort()
      return strings