Wander

while true do
  local Fuel = turtle.getFuelLevel()
  if Fuel <= 5 then
    turtle.refuel()
  end
  local Distance = math.random(4,20)
  local Rotate = math.random(0,1)
  print(Distance .. "/" .. Rotate)
  if Rotate == 1 then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end

  for i=0,Distance do
    turtle.suck()
    os.sleep(0.5)
    if turtle.detect() == true then
      turtle.turnLeft()
    end
    turtle.forward()
  end

end