outline

slot = 1

local function checkSlot()
        if turtle.getItemCount(slot) == 0 then
                slot = slot +1
                turtle.select(slot)
        end
end

turtle.select(slot)

while true do

        while turtle.detectUp() do
                turtle.back()
                turtle.place()
        end

        turtle.turnRight()
        turtle.back()
        turtle.turnLeft()

        if not turtle.detectUp() then
         turtle.forward()
         turtle.turnRight()
        end

----------------------------------------

        while turtle.detectUp() do
                turtle.back()
                turtle.place()
        end

        turtle.turnLeft()
        turtle.back()
        turtle.turnRight()

        if not turtle.detectUp() then
         turtle.turnLeft()
         turtle.forward()
         turtle.forward()
         turtle.turnRight()
        end


end