川を渡る＠コードを学ぼう2

//川を渡る＠コードを学ぼう2
let expert = Expert()
world.place(expert, facing: .south, atColumn: 1, row: 8)
expert.collectGem()
for i in 1 ... 3 {
    expert.moveForward()
    expert.collectGem()
}
expert.turnLockDown()
expert.turnLeft()
for i in 1 ... 4 {
    expert.moveForward()
    if expert.isOnGem {
        expert.collectGem()
    }
}
expert.turnLockUp()
expert.turnRight()
for i in 1 ... 4 {
    expert.moveForward()
    if expert.isOnGem {
        expert.collectGem()
    }
}