Turtle "Auto-Road"

print "Slot 1 = Road    Slot 2 = Decke"
turtle.select(1)
while turtle.getItemCount(1) > 0 and turtle.getItemCount(2) > 0 do
        if turtle.detectDown() then
                turtle.digDown()
                end
        turtle.placeDown()
        if turtle.detectUp() then
                turtle.digUp()
                end
        if turtle.detect() then
                turtle.dig()
                end
    turtle.select(2)
    turtle.turnLeft()
    if turtle.detect() then
    else
        turtle.place()
        end
    turtle.turnRight()
    turtle.turnRight()
    if turtle.detect() then
    else
        turtle.place()
        end
    turtle.turnLeft()
        turtle.up()
    turtle.turnLeft()
    if turtle.detect() then
    else
        turtle.place()
        end
    turtle.turnRight()
    turtle.turnRight()
    if turtle.detect() then
    else
        turtle.place()
        end
    turtle.turnLeft()
    if turtle.detectUp() then
    else
            turtle.placeUp()
        end
        turtle.select(1)
        turtle.down()
    if turtle.detect() then
        turtle.dig()
    else
        end
        turtle.forward()
        if turtle.getItemCount(1) ~= 0 or turtle.getItemCount(2) ~= 0 then

        else
            print "Unzureichende Bloecke"
                end
end