input: Write a function to return a greeting message with a name. 
  assert just_me("Alice") == "Hi, my name is Alice. I am special and nothing else matters.\nWhat about you?"
  assert just_me("Bob") == "Hi, my name is Bob. I am special and nothing else matters.\nWhat about you?"
output: def just_me(name):
      return f"Hi, my name is {name}. I am special and nothing else matters.\nWhat about you?"