void * scrambleArr(void * arr, int numElem, int elemSize, int (*func)(void*)) {
    void * newArr;
    int cPos, newPos,i;

    newArr = (void *)malloc(numElem*elemSize);

    for (i=0 ; i < numElem ; i++)
    {
        cPos = i*elemSize;
        newPos = func((char*)arr+cPos);
        *((char*)newArr+newPos) = *((char*)arr+cPos);
    }
    return newArr;
}

int posArrayBySize(void *el) {
    ARRAY* arr = (ARRAY *)el;
    return arr->size - 1;
}

int main( ) {
    ARRAY * arrSorted;
    int a[2] = {1,2};
    int b[3] = {1,1,1};
    int c[1] = {9};
    int d[4] = {3,3,3,3};
    ARRAY arr[4] = {{a,2},{b,3},{c,1},{d,4}};

    arrSorted =(ARRAY *)scrambleArr(arr,4,sizeof(ARRAY),posArrayBySize);

    free(arrSorted);
    return 0;
}

*((char*)newArr+newPos) = *((char*)arr+cPos);