DoNiFF

void Chislo(Stack *p){
    Stack *t = p;
    int sum = 0;
    int i = 0;
    while (t != NULL){
        sum += t->info;
        i++;
        t = t->next;
    }
    int avg = sum / i;
    t = p;
    while (t->next != NULL){
        t = t->next;
    }
    t->info = avg;
}