input: Write a function to sort a given list of names alphabetically. The function should return the sorted list.
  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", "Ant", "Bear"])==["Ant", "Bear", "Zebra"]
  assert sort_names(["Apple", "apple", "banana"])==["Apple", "apple", "banana"]
output: def sort_names(names):
      return sorted(names)