Do you remember how we filled the array automatically? 
🔥  🔥  🔥  GOOD! 🔥  🔥  🔥  
Now, based on this code, we will create a function that will do this. 
We will call this function filling_the_array. 
Note how we filled two arrays using this function. At the same time, we described the code for filling only once :)

#include <stdio.h>
#include <stdlib.h>
// Declaration
int* filling_the_array(int* array);

int main()
{
    int* ptr_1 = NULL; 
    // Firt function using 
    ptr_1 = filling_the_array(ptr_1);
    for(int i = 0; i<5; i++)
        printf("%d ", *(ptr_1+i));
    
    printf("\n");
    int* ptr_2 = NULL; 
    // Second function using 
    ptr_2 = filling_the_array(ptr_2);
    for(int i = 0; i<5; i++)
        printf("%d ", *(ptr_2+i));
    return 0;
}

// Description
int*  filling_the_array(int* array) {
    int* next_ptr = NULL;
    array = (int*)malloc(5*sizeof(int));
    for(next_ptr = array; next_ptr-array<5; next_ptr++)
        *next_ptr = rand()%9;
    return array;
}