how do i allocate space for new_user->name
int create_user(const char *name, User **user_ptr_add) {
    if (strlen(name) > MAX_NAME - 1) {
        return 2;
    }
    User *new_user = malloc(sizeof(User));
    strcpy(new_user->name, name);
    new_user->next = NULL;
    User *curr = *user_ptr_add;
    while (curr->next != NULL) {
        if (curr->name == name) {
            return 1;
        }
        curr = curr->next;
    }
    curr->next = new_user;
    return 0;
}