function Excrete_netherrack()
	local holder = turtle.getSelectedSlot();
	for i=1,16,1 do
		local x = turtle.getItemDetail(i)
		if not x == nil and x.name == 'minecraft:netherrack' then
			turtle.select(i);
			turtle.drop();
		end
	end
	turtle.select(holder);
end