input: Write a function to sort a given list of names alphabetically.
  
  def sort_names(names):
      names.sort()
      return names
      
  assert sort_names(["John", "Harry", "Robert"])==["Harry", "John", "Robert"]
  assert sort_names(["Anna", "Zoe", "Luke"])==["Anna", "Luke", "Zoe"]
  assert sort_names(["Charlie", "Bravo", "Alpha"])==["Alpha", "Bravo", "Charlie"]
  assert sort_names([])==[]
  assert sort_names(["Eve"])==["Eve"]
output: def sort_names(names):
      names.sort()
      return names