int make_post(const User *author, User *target, char *contents) {
    if (target == NULL || author == NULL) {
        return 2;
    }

    int friends = 0;
    for (int i = 0; i < MAX_FRIENDS && target->friends[i] != NULL; i++) {
        if (strcmp(target->friends[i]->name, author->name) == 0) {
            friends = 1;
            break;
        }
    }

    if (friends == 0) {
        return 1;
    }

    // Create post
    Post *new_post = malloc(sizeof(Post));
    if (new_post == NULL) {
        perror("malloc");
        exit(1);
    }
    strncpy(new_post->author, author->name, MAX_NAME);
    new_post->contents = contents;
    new_post->date = malloc(sizeof(time_t));
    if (new_post->date == NULL) {
        perror("malloc");
        exit(1);
    }
    time(new_post->date);
    new_post->next = target->first_post;
    target->first_post = new_post;

    return 0;
}
/*
 * Make a new post from 'author' to the 'target' user,
 * containing the given contents, IF the users are friends.
 *
 * Insert the new post at the *front* of the user's list of posts.
 *
 * 'contents' is a pointer to heap-allocated memory - you do not need
 * to allocate more memory to store the contents of the post.
 *
 * Return:
 *   - 0 on success
 *   - 1 if users exist but are not friends
 *   - 2 if either User pointer is NULL
 */
