computercraft tree breaker (put fuel in turtle first)

--used to check blocks
function compareTo()
    while turtle.compare() do
        logCode()
    end
end
--checks what can be crafted and to drop it
function slotCheck()
    for i = 1, 8 do
        turtle.select(i)
        if turtle.getSelectedSlot() then
            turtle.drop(64)
        end
    end
    turtle.select(1)
end
--code that breaks trees
function logCode()
    turtle.dig()
    turtle.forward()
    turtle.select(1)

    while turtle.compareUp() do
        turtle.digUp()
        turtle.up()
    end

    while turtle.detectDown() == false do
        turtle.down()
    end

    compareTo()
    turtle.turnLeft()
    compareTo()
    turtle.turnRight()
    turtle.turnRight()
    compareTo()
    turtle.turnRight()
    slotCheck()
    turtle.select(1)
    os.exit()
end

logCode()