tree felling 2

local timeUp
function goUp()
    while turtle.detectUp() do
        turtle.digUp()
        turtle.up()
        timeUp = timeUp + 1
    end
    goDown()
end

function goDown()
    while timeUp ~= 0 do
        turtle.down
        timeUp = timeUp - 1
    end
end

function dropAll()
    for i = 1, 16 do
        turtle.select(i)
        turtle.drop()
    end
end

turtle.dig()
turtle.forward()
goUp()

turtle.dig()
turtle.forward()
goUp()

turtle.turnRight()
turtle.dig()
turtle.forward()
goUp()

turtle.turnRight()
turtle.dig()
turtle.forward()
goUp()

turtle.turnRight()
turtle.forward()

turtle.turnLeft()
turtle.forward()
turtle.turnLeft()
dropAll()