local x, y, z = 0, 0, 0

function verifyFuel()
	if turtle.getFuelLevel() == 0 then
		turtle.select(1)
		turtle.refuel(1)
	end
end

function ejectCobble()
	local slot = 2
	for slot=2, 16 do
		turtle.select(slot)
		if turtle.getItemDetail().name == "minecraft:cobblestone" then
			turtle.drop(turtle.getItemCount(slot))
		end
	end
end

function verifySpace()
	turtle.select(16)
	if turtle.getItemDetail() ~= nil then
		ejectCobble()
	end
end

function doLine()
	for x=1, 10 do
		turtle.select(2)
		turtle.dig("left")
		turtle.forward()

		verifyFuel()
		verifySpace()
	end
end

function doPlan()
	for z=1, 10 do
		doLine()
		if (z % 2) == 1 then
			turtle.turnLeft()
			turtle.select(2)
			turtle.dig("left")
			turtle.forward()
			turtle.turnLeft()
		else
			turtle.turnRight()
			turtle.select(2)
			turtle.dig("left")
			turtle.forward()
			turtle.turnRight()
		end
	end
end

function doCube()
	for y=1, 10 do
		doPlan()
		turtle.turnRight()
		for z=1, 10 do
			turtle.forward()
		end
		turtle.digUp("left")
		turtle.up()
		turtle.turnLeft()
	end
end

doCube()