icon.go

				//If user already select the sender feedback, prepare user nick name and icon here.
				switch {
				case strings.EqualFold(message.Text, "Brown"):
					sendr = linebot.NewSender("Brown", BrownImage)
				case strings.EqualFold(message.Text, "Cony"):
					sendr = linebot.NewSender("Cony", ConyImage)
				case strings.EqualFold(message.Text, "Sally"):
					sendr = linebot.NewSender("Sally", SallyImage)
				default:
					//User input other than our provide range, notify user by quick reply.
					if _, err = bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage("Please select following LINE Friends to reply you: Brown, Cony and Sally.")).Do(); err != nil {
						log.Print(err)
					}
				}
				if sendr != nil {
					//Send message with switched sender.
					if _, err = bot.ReplyMessage(event.ReplyToken, linebot.NewTextMessage("Hi, this is "+message.Text+", Nice to meet you.").WithSender(sendr)).Do(); err != nil {
						log.Print(err)
					}
				}