new_contents: '''Write a function that takes a character
  (i.e. a string of length 1) and returns
  True if it is a vowel, False otherwise.
  '''
  vowels = ['a', 'e', 'i', 'o', 'u', 'y']
  
  
  def vowel(c):
      if c in vowels:
              return True
      else:
          return False
  
subject: Create 4.py