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

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

	verifyFuel()
	verifySpace()
end