void rand_fill(dane *s_pointer, int s_size)
{
    srand(time(NULL));
int surrname_size=0;
int name_size=0;
int i, j, k;
    for( i=0; i<s_size ;i++)
    {
    s_pointer[i].wiek=rand()%100;
    surrname_size=rand()%14;
        for(j=0; j<surrname_size ;j++)
        {
        s_pointer[i].nazwisko[j]=(rand()%26)+'A';
        s_pointer[i].nazwisko[surrname_size]='\0';
        }
    name_size=rand()%14;
        for(k=0; k<name_size ;k++)
        {
        s_pointer[i].imie[k]=(rand()%10)+'A';
        s_pointer[i].imie[name_size]='\0';
        }
    }
}