night

function refuel()
if turtle.getFuelLevel() < 1000 then
  turtle.select(3)
  turtle.suckDown()
  turtle.refuel()
end
end

while true do
  refuel()
  turtle.select(1)
  turtle.digUp()
  turtle.up(2)
  turtle.placeDown()
  turtle.up(24)
  turtle.select(2)
  turtle.placeDown()
end