Fell

local function reset()
    _, blockdata = turtle.inspectDown()

    while blockdata["name"] ~= "minecraft:chest" do
        turtle.down()

        _, blockdata = turtle.inspectDown()

        if blockdata["name"] == "minecraft:chest" then
            break
        end

    turtle.digDown()

    end

    turtle.select(1)
    turtle.dropDown()

    turtle.select(15)
    turtle.suck()
    turtle.place()

end

local function fell()
    _, blockdata = turtle.inspect()

    while blockdata["name"] == "minecraft:log" do
        _, blockdata = turtle.inspect()

        if blockdata["name"] ~= "minecraft:log" then
            break
        end

        turtle.dig()
        turtle.digUp()
        turtle.up()

        ran = true
    end

    if ran == true then
        ran = false
        reset()
    end
end

local function refuel()
    if turtle.getFuelLevel() < 20 then
        turtle.select(16)
        turtle.refuel()
    end
end

if turtle.getFuelLevel() == "unlimited" then
    needsFuel = false
end

while true do
    turtle.turnRight()
    fell()

    if needsFuel then
        refuel()
    end

end