LumberBot

while true do

    local boolInspect, inspect = turtle.inspect()
    local y = 0

    if inspect["name"] == "minecraft:log" then

        turtle.suckDown(4)

        if turtle.getFuelLevel() < 9000 then
            turtle.turnRight()
            turtle.dig()
            turtle.forward()
            turtle.select(16)
            turtle.suck(64)
            turtle.refuel()
            turtle.drop(64)
            turtle.select(1)
            turtle.back()
            turtle.turnLeft()
        end

        turtle.dig()
        turtle.forward()

        while inspect["name"] == "minecraft:log" do
            turtle.dig()
            turtle.digUp()
            turtle.up()
            boolInspect, inspect = turtle.inspectUp()
            y = y + 1
        end
        turtle.dig()
        turtle.digUp()
        turtle.up()
        y = y + 1

        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        turtle.turnRight()
        turtle.dig()

        for i=y, 1, -1 do
            turtle.digDown()
            turtle.down()
            turtle.dig()
        end

        turtle.place()
        turtle.turnLeft()
        turtle.back()
        turtle.place()
        turtle.turnRight()
        turtle.place()
        turtle.back()
        turtle.place()
    end
end