function refuel()
  turtle.select(1)
  turtle.refuel(1)
end

function moveForward()
  if turtle.getFuelLevel() < 80 then refuel() end
  for i=1,4 do
    if turtle.moveForward() == false
      turtle.dig()
      turtle.digUp()
      turtle.attack()
    end
  end
end

function turnAround()
  turtle.turnRight()
  turtle.turnright()
end