function forward()
	while not turtle.forward() do
		turtle.dig()
		turtle.attack()
	end
end
function downward()
	while not turtle.down() do
		turtle.digDown()
		turtle.attackDown()
	end
end
function upward()
	while not turtle.up() do
		turtle.digUp()
		turtle.attackUp()
	end
end
function selectItem(item)
	for i=1, 16 do
		local d = turtle.getItemDetail(i)
		if d ~= nil then
			if d.name == "minecraft:"..item then
				turtle.select(i)
				return true
			end
		end
	end
	return false
end
function isLog(s,d)
	if s then
		if d.name == "minecraft:log" and d.damage == 15 then
			return true
		end
	end
	return false
end
function farmWood()
	if isBlock(turtle.inspect()) then
		forward()
		while isLog(turtle.inspectUp()) do
			upward()
		end
		while turtle.down() do end
		turtle.back()
	end
end