Write a program that runs a TCP service to reverse a string

main.go

package main

import (
	"bufio"
	"fmt"
	"net"
	"os"
	"strings"
)

func main() {
	arguments := os.Args
	if len(arguments) == 1 {
		fmt.Println("Please provide a port number!")
		return
	}

	port := ":" + arguments[1]
	fmt.Printf("Listening on %v\n", port)
	l, err := net.Listen("tcp4", port)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer l.Close()

	for {
		c, err := l.Accept()
		if err != nil {
			fmt.Println(err)
			return
		}
		go handleConnection(c)
	}
}

func handleConnection(c net.Conn) {
	fmt.Printf("Serving %s\n", c.RemoteAddr().String())
	for {
		netData, err := bufio.NewReader(c).ReadString('\n')
		if err != nil {
			fmt.Println(err)
			return
		}

		temp := strings.TrimSpace(string(netData))
		if temp == "stop" {
			break
		}

		result := reverse(temp) + "\n"
		c.Write([]byte(string(result)))
	}
	c.Close()
}

func reverse(in string) string {
	var sb strings.Builder
	runes := []rune(in)
	for i := len(runes) - 1; 0 <= i; i-- {
		sb.WriteRune(runes[i])
	}
	return sb.String()
}