tree

local function fuelCheck()
        print(turtle.getFuelLevel())
        if turtle.getFuelLevel() < 50 then
				turtle.select(16)
                turtle.refuel()
                print(turtle.getFuelLevel())
        end
end


local function startpos()

	while (not rs.getInput("bottom")) do
		while not turtle.down() do turtle.digDown() end
	end
end

local function replant()
	turtle.select(1)
	turtle.dig()
	turtle.place()
end

local function cut()
	while (not rs.getInput("top")) do
		turtle.dig()
		while not turtle.up() do turtle.digUp() end
	end
end

local function checktree()
	while (turtle.up() and turtle.up()) do
		startpos()
		sleep(120)
	end
end


while true do
	fuelCheck()
	startpos()
	checktree()
	cut()
	startpos()
	replant()
end