miner

slot = {
    fuel = 1,
}

function forward()
    while turtle.detect() do
        turtle.dig()
    end

    while (turtle.getFuelLevel() < 16) do
        turtle.select(slot.fuel)
        turtle.refuel()
    end

    turtle.forward()
end

size = 4
height = 4
for h = 1, height do
    for x = 1, size do
        for y = 1, size do
            turtle.digUp()
            forward()
        end

        if (j % 2 != i % 2) then
            turtle.turnLeft()
            forward()
            turtle.turnLeft()
        else
            turtle.turnRight()
            forward()
            turtle.turnRight()
        end
    end

    turtle.up()
    turtle.digUp()
    turtle.up()
    turtle.turnLeft()
    turtle.turnLeft()
end