#include <stdio.h>
#include <stdlib.h>

struct struct2
{
    int x;
};

struct struct1
{
    struct struct2 *obj;
};

void test(struct struct1 **arr)
{
    for (int i = 0; i < 20; i++)
    {
        arr[i]->obj = malloc(sizeof(struct struct2));
        (*arr)[i].obj[0].x = i + 2;

        printf("%d: %d, [%d]\n", i, (*arr)[i].obj->x);
    }
}

int main()
{
    struct struct1 *prvni_s;
    prvni_s = malloc(sizeof(struct struct1) * 10);
    test(&prvni_s);

    return 0;
}