protocol Fighter{
    func fight() //Requirement method
//    func punch() //Requirement. Uncomment to see changes
}

extension Fighter{
    //Requirement common implementation
    func fight(){
        self.punch()
    }

    //Static method (it is not defined in the protocol)
    func punch(){
        print("Fighter punch")
    }
}

protocol MagicalFighter : Fighter{
    func castSpell() //Requirement
}

extension MagicalFighter{
    //Requirement common implementation
    func castSpell(){
        print("MagicalFighter casted a spell")
    }

    //Static
    func punch(){
        self.castSpell()
        print("Magical fighter punch")
    }

//    Requirement. Uncomment to see changes
        func fight(){
            self.punch()
        }

}

struct Hero : MagicalFighter{
    func castSpell(){
        print("Hero casted a special spell")
    }
}

let gordo = Hero()
gordo.fight()