sort arr/ swap + extra

#include <stdio.h>
#define SIZE 10

//https://otvet.mail.ru/question/211049328

void sort_arr(int *,int);
void print_arr(int *,int);
void swap_elements(int *,int *);
int  get_smallest(int *,int *,int);


int main()
{
    int index ,arr1[SIZE] = {3,5,0,-3,1,2,5,4,3,5};
    int arr2[SIZE] = {8,-3,18,2,3,4,33,4,2,5};


    print_arr(arr1,SIZE);
    print_arr(arr2,SIZE);
    sort_arr(arr1,SIZE);
    print_arr(arr1,SIZE);
    sort_arr(arr2,SIZE);
    print_arr(arr2,SIZE);
    index = get_smallest(arr1,arr2,SIZE);
    printf("smallest number in arr1, which doesnt coincide with number in arr2\n");
    printf("is %d, and its index is %d\n",arr1[index],index);

    return 0;
}
void print_arr(int *a1,int s)
{
    int i;
    for(i=0;i<s;i++)
    {
        printf("%d\t",a1[i]);
    }
    printf("\n");
}
void sort_arr(int *a1,int s)
{
    int i,j,t;
    for(i=0;i<s-1;i++)
    {
        //printf("\ni is %d\n",i);
        for(j=i+1;j<s;j++)
        {
           //printf("%d\t",j);

            if(a1[i] > a1[j])
            {
                swap_elements(&a1[i],&a1[j]);
                // t = a1[i]; //without swap()
                //a1[i] = a1[j];
                //a1[j] = t;

            }
        }



    }
}
void swap_elements(int *el1,int *el2)
{
    int temp= *el1;//value
    *el1 =  *el2;
    *el2 = temp;

}
int get_smallest(int *a1,int *a2,int s)
{
    int i,j,result,flag;
    for(i=0;i<s;i++)
    {
        flag = 0;
        for(j=0;j<s;j++)
        {
            if(a1[i]==a2[j])
            {
                flag =1;
                break;//exits for j
            }

        }
        if(flag ==0)
            break;//exits for i
    }
    return i;
}