struct PrizeItem {

    enum Rank {
        case Ok //Purple
        case Good //Blue
        case Epic //Green
        case Rare //Yellow
        case ExtremelyRare //Red
    }



    let name : String
    let description : String

    let rank : Rank


    let identifier : String

    let color : UIColor

    var prizeIsActive : Bool! //<-- Important

    //Important Functions
    mutating func setToActive(){
        prizeIsActive = true
    }
    mutating func setToNotActive(){
        prizeIsActive = false
    }


}

func setPrizeToActive(prize:PrizeItem){

        prize.setToActive() <-- error here

    }