I need some assistence with editing this C program Any help

I need some assistence with editing this C program. Any help is appreciated.

1. (30 points) Note: This program will be graded based on whether the required functionality wereimplemented correctly instead of whether it produces the correct output, for the functionality part(80% of the grade).
Modify insert.c (attached, Project 2, #1), the insert0 detection function using pointer arithmetic.The function prototype should be the following. Name your program insert2.c.

void insert0(int n, int *a1, int *a2);
The function should use pointer arithmetic – not subscripting – to visit array elements. In other words,eliminate the loop index variables and all use of the [] operator in the function.

#include <stdio.h>
void insert0(int n, int a1[], int a2[]);
int main(void){  

int i;   
   int N;  

printf(\"Please enter the length of the input array: \");
   scanf(\"%d\", &N);

int a[N];
   int b[2*N];

printf(\"Enter %d numbers for the array: \", N);
   for (i = 0; i < N; i++)
   scanf(\"%d\", &a[i]);

insert0(N, a, b);

printf(\"Output array:\");
   for (i = 0; i < 2*N; i++)    
   printf(\" %d\", b[i]);  
   printf(\"\ \");

return 0;
}
void insert0(int n, int a[], int b[]) {
   int i, j = 0;
   for(i = 0; i < n; i++, j+=2) {   
   b[j]= a[i];   
   b[j+1] = 0;
}

}

Solution

#include <stdio.h>
void insert0(int n, int *a1, int *a2);
int main(void){
int i;   
int N;
printf(\"Please enter the length of the input array: \");
scanf(\"%d\", &N);
int a[N];
int b[2*N];
printf(\"Enter %d numbers for the array: \", N);
for (i = 0; i < N; i++)
scanf(\"%d\", &a[i]);
insert0(N, a, b);
printf(\"Output array:\");
for (i = 0; i < 2*N; i++)
printf(\" %d\", b[i]);
printf(\"\ \");
return 0;
}
void insert0(int n, int *a, int *b) {
int i, j = 0;
for(i = 0; i < n; i++, j+=2) {   
*(b+j)= *(a+i);   
*(b+j+1) = 0;
}
}