wall

function goForward()
    while not(turtle.forward()) do
        turtle.attack()
    end
end

function goDown()
    while not(turtle.down()) do
        turtle.attackDown()
    end
end

function goUp()
    while not(turtle.up()) do
        turtle.attackUp()
    end
end

function checkMaterial()
    if turtle.getItemCount(curslot)>0 then
        return true
    end
    curslot=curslot+1
    turtle.select(curslot)
    if curslot>14 then
        curslot=1
    end
    return false
end

function wall()
    while cutY<height do
        turtle.digUp()
        goUp()
        cutY = cutY+1
        while not(checkMaterial()) do
            sleep(0.1)
        end
        turtle.placeDown()
    end
end

curslot=1
turtle.select(curslot)
cutY=0

local arg = { ... }
length = tonumber(arg[1])
height = tonumber(arg[2])

for curL=1,length,1 do
    turtle.dig()
    goForward()
    while cutY>0 do
        turtle.digDown()
        goDown()
        cutY = cutY-1
    end
    wall()

end