input: Write a function to sort a given list of names alphabetically. If the list is empty, return an empty list.
  assert sort_names(["John", "Harry", "Robert"])==["Harry", "John", "Robert"]
  assert sort_names(["Alice", "Bob", "Charlie"])==["Alice", "Bob", "Charlie"]
  assert sort_names(["Zebra", "Apple", "Banana"])==["Apple", "Banana", "Zebra"]
  assert sort_names([])==[]
output: def sort_names(names):
      return sorted(names)