old_contents: def hey(string):
      pass
  
new_contents: def hey(s):
      s = s.strip()
      if s.isupper():
          return "Whoa, chill out!"
      elif s == "":
          return "Fine. Be that way!"
      elif s[-1] == "?":
          return "Sure."
      else:
          return "Whatever."
  
subject: Add initial solution