poly *poly_duplicate(poly *P ){
    node *tempNode = P->terms;
    node *duplicateNode;
    node *nextNode = NULL;
    poly *p = malloc(sizeof(poly));
    for (int i=0; i < P->num_terms; i++) {
        tempNode->next = duplicateNode;
        duplicateNode = tempNode;
        p->terms = P->terms;
        p->num_terms = P->num_terms;
        //duplicateNode = tempNode;
        //tempNode = tempNode->next;
    }
    return p;
    //return NULL;
}