int addNode_str2(char* val,str_node_t **nd){
    str_node_t* node = (str_node_t* )malloc(sizeof(mpz_node_t));
    if(node==NULL) return -1;
    strcpy(node->value,val); //make a copy or it disapear...
    if((*nd) == NULL || (*nd)->last == NULL){
        (*nd) = node;
        (*nd)->last = node;
    }else {
        (*nd)->last -> next = node;
        (*nd)->last = node;
    }
    return 0;
}