input: Write a python function to print "Hello, World!" five times.
  assert hello_world() == ["Hello, World!", "Hello, World!", "Hello, World!", "Hello, World!", "Hello, World!"]
  assert hello_world() == ["Hello, World!", "Hello, World!", "Hello, World!", "Hello, World!", "Hello, World!"]
output: def hello_world():
      return ["Hello, World!"] * 5