void add(char* time1, char* time2){
    num_seconds_t seconds1, seconds2, total;
    struct time_spec_t *spec1 = malloc(sizeof(spec1));
    struct time_spec_t *spec2 = malloc(sizeof(spec2));
    struct time_spec_t *total_time = malloc(sizeof(total_time));

    if ((is_legal_seconds(time1))) {
        seconds1 = string_to_seconds(time1);
    } else if ((is_legal_time_spec(time1))) {
        spec1 = string_to_time_spec(time1);
        seconds1 = time_spec_to_seconds(spec1);
    } else {
        //error
    }

    if ((is_legal_seconds(time2))) {
        seconds2 = string_to_seconds(time2);
    } else if ((is_legal_time_spec(time2))) {
        spec2 = string_to_time_spec(time2);
        seconds2 = time_spec_to_seconds(spec2);
    } else {
        //error
    }

    total = seconds1 + seconds2;
    if (total < 3155760000){
        total_time = seconds_to_time_spec(total);
        print_time_spec(total_time);
        exit(0);
    } else {
        fprintf(stderr,"Error adding time");
        exit(0);
    }
}