code: func (s *SubnetKey) String() string {
  	k := fmt.Sprintf("%s/%s", s.AddressSpace, s.Subnet)
  	if s.ChildSubnet != "" {
  		k = fmt.Sprintf("%s/%s", k, s.ChildSubnet)
  	}
  	return k
  }
docs: // String returns the string form of the SubnetKey object