changing an item in an array in c

1// Change the pointer of the array
2void change(int **array, int length)
3{
4    *array = malloc(length * sizeof(int));
5    if (*array == NULL)
6        return;
7    for (int i = 0 ; i < length ; i++)
8        (*array)[i] = 1;
9}

1#include <stdio.h>
2#define PI 3.142
3int main(){
4    int a[5] ={12, 21, 34, 23, 13};
5    printf("Initial value of index 1: %d\n", a[1]);
6    a[1] = 43;
7    printf("Final value of index 1: %d\n", a[1]);
8    
9}