Replace stuff with stone 2

function PlaceStone()
    if turtle.detectDown() then
        turtle.digDown()
        turtle.select( 1 )
        turtle.drop()
    end
    for x=1,9 do
        if turtle.getItemCount(x) then
            turtle.select(x)
            turtle.placeDown()
        end
    end
end


for i=1,9 do
    while turtle.getItemCount(i) do
        turtle.select(9)
        if not turtle.compareDown() then
            PlaceStone()
        end
        turtle.forward()
    end
end