Add TODO note

src/server.c

@@ -220,7 +220,7 @@ int disconnect_client(int client_id) {
 /* Thread, Dispatcher : pop message from the stack, parse it and send it to the good ClientSender */
 void *Dispatcher(void *arg) {
     char buf[BUF_LEN];
-    char message[1024];
+    char message[1024]; // TODO: replace by malloc
     int n = 0 ;
     int k = 0 ;