todoIrc

client.go

func (c *Client) Leave(channels ...string) {
	for _, channel := range channels {
		go c.send(fmt.Sprintf("PART #%s", channel)) //prob worst way
	}
}

func (c *Client) Leave(channels ...string) {
	var channelListString string
	for _, channel := range channels {
		channelListString += fmt.Sprintf("#%s ", channel) //seems good but 5 lines
	}
	go c.send(fmt.Sprintf("PART %s", channelListString))
}

func (c *Client) Leave(channelListString string) {
	go c.send(fmt.Sprintf("PART %s", channelListString))  //bad func argument format
}

Idk if strings.Builder is the right choice tho because it's go1.10+ only