max = 10
round = 1

function pickUp()
  for i = 0, 5 do turtle.suck(64) end
  for i = 0, 5 do turtle.suckUp(64) end
  for i = 0, 5 do turtle.suckDown(64) end
end

function moveAndRefuelIfNeeded()
  success = turtle.forward()
  if not success then
    i = 1
    while not turtle.refuel() and i < 17 do
      turtle.select(i)
      i = i + 1
    end
  end
end

function digAndMove()
  success, data = turtle.detectUp()
  if success then
    turtle.digUp()
    pickUp()
  end

  success, data = turtle.detectDown()
  if success then
    turtle.digDown()
    pickUp()
  end

  success, data = turtle.detect()
  if success then
    turtle.dig()
    pickUp()
  end

  moveAndRefuelIfNeeded()
end

while round < max do

  for i = 0, max do
    digAndMove()
  end

  turtle.turnLeft()
  digAndMove()
  turtle.turnLeft()

  for i = 0, max do
    digAndMove()
  end

  turtle.turnRight()
  digAndMove()
  turtle.turnRight()

  print("Round", round, "done")
  round = round + 1
end

print("Done!")