fix: add newline to response message in handleRequest

Ensure proper message formatting by adding a newline character to the response message before writing to the connection.

main.go

@@ -72,7 +72,7 @@ func handleRequest(conn net.Conn) {
 	} else {
 		responseMsg = "error: unknown message"
 	}
-	if _, err := conn.Write([]byte(responseMsg)); err != nil {
+	if _, err := conn.Write([]byte(responseMsg + "\n")); err != nil {
 		postLog.Error(fmt.Sprintf("Failed to write: %v, err: %v", conn, err))
 	}
 }