input: Write a python function to print a greeting for each name in a list.
  assert greeting_names(["Alice", "Bob", "Charlie"]) == ["Hello Alice!", "Hello Bob!", "Hello Charlie!"]
  assert greeting_names(["Xena", "Yuri"]) == ["Hello Xena!", "Hello Yuri!"]
  assert greeting_names([]) == []
output: def greeting_names(names):
      return [f"Hello {name}!" for name in names]