how to create pure echo server - in about 20+ code lines [golang] [20lines]

main.go

package main

import (
	"fmt"
	"net"
)

func handle(conn net.Conn) {
	defer conn.Close()
	var readBuf = make([]byte, 512)
	var readCnt int
	var err error

	for {
		if readCnt, err = conn.Read(readBuf); err != nil { break }
		fmt.Printf("received: %s", string(readBuf))
		if _, err = conn.Write(readBuf[0:readCnt]); err != nil { break }
	}
}

func main() {
	socket, _ := net.Listen("tcp", ":8765")
	for {
		conn, _ := socket.Accept()
		go handle(conn)
	}
}

output.txt

[shell-1 ]$ go run main.go
received: ECHO a
received: ECHO b
received: ECHO c

[shell-2 ]$ for i in a b c ; do echo "ECHO $i" | nc localhost 8765 ; done
ECHO a
ECHO b
ECHO c