Sliding Window Sum

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    int sum =0;
    for(int i = 0 ; i <= n-k ;i++){
        for (int j = 0 ; j < k ; j ++ ){
            sum = sum + arr[i+j];
            //printf("%d\n",sum);
        }
        printf("%d ",sum);
        sum =0;
    }
}

int main() {
    int n, k, arr[100];
    scanf("%d %d", &n, &k);
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);

    sliding_window_sum(arr, n, k);
    return 0;
}