print even indices of a 1D arr using recursion

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define size 10


void printDigits(int arr[size], int index){
        if(index >= size)
            return;
        if(index % 2 == 0)
        printf("%d ", arr[index]);

        printDigits(arr,++index);

}

int main() {
    srand((time(NULL)));
    int arr[size];
    for(int i=0;i<size;i++)
    arr[i] = (1+ rand() % (10-1+1));

for(int s=0;s<size;s++)
    printf("%d ", arr[s]);
    puts("");
    printDigits(arr, 0);

    return 0;
}