input: Write a function to sort a given list of names alphabetically and return the sorted list. If the input list is empty, return an empty list.
  def sort_names(names):
      if not names:
          return []
      names.sort()
      return names
  
  assert sort_names(["John", "Harry", "Robert"])==["Harry", "John", "Robert"]
  assert sort_names(["Alice", "Bob", "Charlie"])==["Alice", "Bob", "Charlie"]
  assert sort_names([])==[]
  assert sort_names(["Zebra", "Antelope", "Baboon"])==["Antelope", "Baboon", "Zebra"]
  assert sort_names(["Max", "Anna", "Tom"])==["Anna", "Max", "Tom"]
output: def sort_names(names):
      if not names:
          return []
      names.sort()
      return names