if (FD_ISSET(listen_soc, &listen_fds)) {
    client_fd = accept_connection(listen_soc, client_list);
    printf("main (test) client fd: %d\n", client_fd);
    if (client_fd == -1) {
        perror("accept");
        return -1;
    }
    printf("clinet_fd: %d\n", client_fd);
    printf("max_fd: %d\n", max_fd);

    Client *client_ptr = find_client(client_fd, client_list);

    if (client_ptr != NULL) {
        printf("client found\n");
    }
    if (client_ptr == NULL) {
        printf("main _ new connection\n");
        write(client_fd, "What is your user name?\n", 24);
        User *user = check_and_add_user(user_list, client_fd);

        Client *temp_client = client_list;
        while (temp_client != NULL) {
            temp_client = temp_client->next;
        }
        temp_client->fd = client_fd;
        temp_client->user = user;
        temp_client->username = user->name;
        temp_client->next = NULL;

    } else {
        cleanup_args_for_processing(user_list, client_fd, client_list);
    }