Wall

function countInventory()
local total = 0

    for slot = 1, 16 do
        total = total + turtle.getItemCount(slot)
    end
    return total
end

function selectAndPlaceDown()

    for slot = 1, 16 do
        if turtle.getItemCount(slot) > 0 then
            turtle.select(slot)
            turtle.placeDown()
            return
        end
    end
 end


function buildWall(length, height)
    if hare.countInventory() < length * height then
        return false
    end

    turtle.up()

local movingForward = true

    for currentHeight = 1, height do
        for currentLength = 1, length do
            selectAndPlaceDown()
        if movingForward and currentLength ~= length then
            turtle.forward()
        elseif not movingForward and currentLength ~=length then
            turtle.back()
        end
    end
        if currentHeight ~= height then
            turtle.up()
        end
    movingForward = not movingForward
end