ReviewNode *insertMovieReview(char *title, char *studio, int year, double BO_total, int score,
                              ReviewNode *head)
{
    /***************************************************************************/
    /**********  TODO: Complete this function **********************************/
    /***************************************************************************/
    ReviewNode *p = NULL;
    p = head;
    while (p != NULL) {
        if (strcmp(title, p -> review.movie_title) == 0 && \
                strcmp(studio, p -> review.movie_studio) == 0 && \
                year == p -> review.year && \
                BO_total == p -> review.BO_total && \
                score == p -> review.score) {
            return head;
        }
        p = p -> next;
    }
    ReviewNode *new_node = newMovieReviewNode(title, studio, year, BO_total, score);
    new_node -> next = head;
    return new_node;
}