function Excrete_netherrack()
	local holder = turtle.getSelectedSlot();
	for i=1,16,1 do
		local x = turtle.getItemDetail(i)
		if x == nil then
			-- break;
		else
			if x.name == 'minecraft:netherrack' then
				turtle.select(i);
				turtle.drop();
			end
		end
	end
	turtle.select(holder);
end