provider/rcode0.go
func rcodezeroChangesByZone(zones []*rc0.Zone, changeSet []*rc0.RRSetChange) map[string][]*rc0.RRSetChange {

	changes := make(map[string][]*rc0.RRSetChange)
	zoneNameIDMapper := zoneIDName{}
	for _, z := range zones {
		zoneNameIDMapper.Add(z.Domain, z.Domain)
		changes[z.Domain] = []*rc0.RRSetChange{}
	}

	for _, c := range changeSet {
		zone, _ := zoneNameIDMapper.FindZone(c.Name)
		if zone == "" {
			log.Debugf("Skipping record %s because no hosted zone matching record DNS Name was detected ", c.Name)
			continue
		}
		changes[zone] = append(changes[zone], c)
	}

	return changes
}
func rcodezeroChangesByZone(zones []*rc0.Zone, changeSet []*rc0.RRSetChange) map[string][]*rc0.RRSetChange {

	changes := make(map[string][]*rc0.RRSetChange)
	zoneNameIDMapper := zoneIDName{}
	for _, z := range zones {
		zoneNameIDMapper.Add(z.Domain, z.Domain)
		changes[z.Domain] = []*rc0.RRSetChange{}
	}

	for _, c := range changeSet {
		zone, _ := zoneNameIDMapper.FindZone(c.Name)
		if zone == "" {
			log.Debugf("Skipping record %s because no hosted zone matching record DNS Name was detected ", c.Name)
			continue
		}
		changes[zone] = append(changes[zone], c)
	}

	return changes
}
// Helper function