You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: net.go
    path of file: ./repos/vald/internal/net
    
    the code of the file until where you have to start completion: //
// Copyright (C) 2019-2024 vdaas.org vald team <vald@vdaas.org>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// You may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by appli
    
func (n NetworkType) String() string {
	switch n {
	case UNIX:
		return "unix"
	case UNIXGRAM:
		return "unixgram"
	case UNIXPACKET:
		return "unixpacket"
	case TCP:
		return "tcp"
	case TCP4:
		return "tcp4"
	case TCP6:
		return "tcp6"
	case UDP:
		return "udp"
	case UDP4:
		return "udp4"
	case UDP6:
		return "udp6"
	case ICMP:
		return "icmp"
	case IGMP:
		return "igmp"
	case ICMP6:
		return "ipv6-icmp"
	}
	return "unknown"
}