違う型のインスタンスを使う＠コードを学ぼう2

//違う型のインスタンスを使う＠コードを学ぼう2
let expert = Expert()
let character = Character()

expert.moveForward()
expert.turnLockUp()
for i in 1 ... 2 {
    for i in 1 ... 2 {
        character.moveForward()
        if character.isOnGem {
            character.collectGem()
        }
    }
    character.turnRight()
}
expert.turnLockDown()
expert.turnLockDown()

character.turnLeft()
character.moveForward()
character.collectGem()