input: Write a python function to split a string into a list of words.
  assert convert_to_list("Hello, World!") == ["Hello,", "World!"]
  assert convert_to_list("Python is great") == ["Python", "is", "great"]
  assert convert_to_list("I love programming") == ["I", "love", "programming"]
output: def convert_to_list(s):
      return s.split()