code: func (rt *routingTable) Remove(id *bitmap) {
  	if nd, bucket := rt.GetNodeKBucktByID(id); nd != nil {
  		bucket.Replace(nd)
  		rt.cachedNodes.Delete(nd.addr.String())
  		rt.cachedKBuckets.Push(bucket.prefix.String(), bucket)
  	}
  }
docs: // Remove deletes the node whose id is `id`.