Reverse an Array In-Place

#include <stdio.h>

void reverse(int *start, int *end){
    if(start == NULL || end == NULL){
        return;
    }

    while(start < end){
        int temp_int = *start;
        *start = *end;
        *end = temp_int;
        start++;
        end--;
    }
}

void reverse_array(int arr[], int n) {
    // Your logic here
    if(arr == NULL || n <= 1) {
        return;
    }
    reverse(&arr[0], &arr[n - 1]);
}

int main() {
    int n;
    scanf("%d", &n);

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

    reverse_array(arr, n);

    for (int i = 0; i < n; i++) {
        printf("%d", arr[i]);
        if(i < n-1){
        	printf(" ");
        }
    }
    return 0;
}