input: Write a python function to convert a string to a list by splitting it on spaces.
  assert convert_to_list('Hello world') == ['Hello', 'world']
  assert convert_to_list('Python is awesome') == ['Python', 'is', 'awesome']
  assert convert_to_list('This is a test') == ['This', 'is', 'a', 'test']
output: def convert_to_list(s):
      return s.split()