height = 0
if turtle.detect() then
    turtle.dig()
    turtle.forward()
    while turtle.detectUp() do
        height = height + 1
        turtle.digUp()
        turtle.up()
    end
    while height > 0 do
        height = height - 1
        tutle.down()
    end
    turtle.digDown()
    turtle.back()
    turtle.turnLeft()
    turtle.drop()
    turtle.drop()
    turtle.turnRight()
end