nether

local function refuel()
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" or fuelLevel > 0 then
        return
    end

    local function getfuel()
        if turtle.getItemCount(16) == 0  then
            turtle.select(14)
            turtle.place()
            turtle.select(16)
            turtle.suck()
            turtle.select(14)
            turtle.dig()
            turtle.select(1)
        end
        turtle.select(1)
    end

    local function tryRefuel()
        for n=1,16 do
            if turtle.getItemCount(n) > 0 then
                turtle.select(n)
                if turtle.refuel(1) then
                    turtle.select(1)
                    return true
                end
            end
        end
        turtle.select(1)
        return false
    end

    if not tryRefuel() then
        print( "Add more fuel to continue." )
        while not tryRefuel() do
            sleep(1)
        end
        print( "Resuming dig." )
    end
end

local function strip()
    refuel()
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnRight()
end

for x=1, 50 do
    strip()
end