Do we need Wallet in TypeExercises?

[sanjivsahayamrea]

We cover most of what Wallet does in TypeExercises with Person. Do we need to double up?

 //Type -> String
  def showWallet(wallet: Wallet): String = ???

is the same as:

def showPerson1(person: Person): String 
def showPerson2(person: Person): String 

 //immutable copy
  def purchase(cost: Double, wallet: Wallet): Wallet = ???

is the same as:

 def changeName(newName: String, person: Person): Person = ???

[wjlow]

I think this is a good one to keep.

Redundancy may be useful at this point since this is right at the very beginning.