covererUP

local function movefw()
	z=false
	while z==false do
		z=turtle.forward()
		if turtle.detect()==true then
			z=true
		else
			sleep(0.1)
		end
	end
end

stop = false
k = 0
slotNum = 1
turtle.down()
while stop==false do
	if turtle.detectUp() == false then
		if turtle.getItemCount(slotNum)==0 then
			slotNum = slotNum+1
			turtle.select(slotNum)
			if turtle.getItemCount(slotNum)==0 then
				stop = true
			else
				turtle.placeUp()
				if turtle.detect() == false then
					movefw()
					k=0
				else
					turtle.turnRight()
					movefw()
					k = k + 1
				end
			end
		else
			turtle.placeUp()
			if turtle.detect() == false then
				movefw()
				k=0
			else
				turtle.turnRight()
				movefw()
				k = k + 1
			end
		end
	else
		turtle.back()
		turtle.turnRight()
		movefw()
		k = k + 1
		if k>=4 then
			stop = true
		end
	end
end