Remove an element from an array and re-compact it, with recursion

recdel.c

#include <stdio.h>
#include <malloc.h>

#define N 8


/** Recursive delete like a pro
 * where: 'ar' is the array, 'n' is the size, 'start' is 0 when
 * called first time, 'irem' is the index of element to remove.
 * @return the new size of the array (n-1)
 */
int recdel (int *ar, int n, int start, int irem)
{
	if (start == n-1)
		return start;

	if (start >= (irem-1))
		ar[start] = ar[start+1];

	return recdel (ar,n,start+1,irem);
}




void print_ar (int *a, int n)
{
	for (int i=0;i<n;i++) printf ("%d ", a[i]);
	printf ("\n\n");
}

int main ()
{
	int *ar = (int *) malloc (sizeof(int) * N);

	// Inizializzo con numeri a caso
	for (int i=0; i<N; i++) ar[i] = i+1;

	print_ar (ar, N);

	printf ("Elimino il 6' elemento\n");

	// Elimino il 6 elemento e ricompatto
	int n = recdel (ar, N, 0, 6);

	print_ar (ar, n);
}