wall maker

for slot = 1, 16 do
    turtle.select(slot)
    local blocks = 64
    while blocks > 0 do
        if turtle.inspectDown() then
            turtle.up()
            turtle.placeDown()
            turtle.forward()
            turtle.down()
            blocks = blocks - 1
        else
            turtle.up()
            turtle.back()
            turtle.turnRight()
            turtle.forward()
            turtle.down()
        end
    end
end