Minecraft clearArea function

lenght = 3
rows = 2
height = 3

function clearLine()
    for i=1, lenght - 1 do
        turtle.dig()
        turtle.forward()
    end
end

function clearLayer()
    if rows%2 == 1 and height > 0 then
        for i=1, rows do
            clearLine()
            if i%2 == 1 and i < rows then
                turtle.turnRight()
                turtle.dig()
                turtle.forward()
                turtle.turnRight()
            elseif i < rows then
                turtle.turnLeft()
                turtle.dig()
                turtle.forward()
                turtle.turnLeft()
            end
        end
        height = height - 1
        if height > 0 then
            turtle.digUp()
            turtle.up()
            turtle.turnRight()
            turtle.turnRight()
        end
    elseif height > 0 then
        for x=1, rows do
            if x%2 == 1 and height > 0 then
                for i=1, rows do
                    clearLine()
                    if i%2 == 1 and i < rows then
                        turtle.turnRight()
                        turtle.dig()
                        turtle.forward()
                        turtle.turnRight()
                    elseif i < rows then
                        turtle.turnLeft()
                        turtle.dig()
                        turtle.forward()
                        turtle.turnLeft()
                    end
                end
            elseif height > 0 then
                for i=1, rows do
                    clearLine()
                    if i%2 == 1 and i < rows then
                        turtle.turnLeft()
                        turtle.dig()
                        turtle.forward()
                        turtle.turnLeft()
                    elseif i < rows then
                        turtle.turnRight()
                        turtle.dig()
                        turtle.forward()
                        turtle.turnRight()
                    end
                end
            end
            height = height - 1
            if height > 0 then
                turtle.digUp()
                turtle.up()
                turtle.turnRight()
                turtle.turnRight()
            end
        end
    end
end

function clearPlatformArea()
    turtle.dig()
    turtle.forward()
    while height > 0 do
        clearLayer()
    end
end

clearPlatformArea()