code: func (tab *Table) Resolve(n *enode.Node) *enode.Node {
  	tab.mutex.Lock()
  	cl := tab.closest(n.ID(), 1, false)
  	tab.mutex.Unlock()
  	if len(cl.entries) > 0 && cl.entries[0].ID() == n.ID() {
  		return unwrapNode(cl.entries[0])
  	}
  	return nil
  }
docs: // Resolve searches for a specific node with the given ID.
  // It returns nil if the node could not be found.