Tell me how to complete the function using recursion?
The program has input data (100 37)

Sample Input:

100 37

Sample Output:

100 37
200 18
400 9
800 4
1600 2
3200 1
3200
3200 1600 0 3200
3200 800 0 3200
3200 400 1 3600
3600 200 0 3600
3600 100 1 3700
3700

    int rusMult(int a, int b)
{
    
    if (b <= 0)
    {

    }
    if (b > 0) 
    {
        int res = rusMult(a * 2, b / 2);
        int ost = b % 2;
        printf("%dt %dt %dt %dtn", a, b, ost, res);
        if (ost == 1)
        {
            res += a;
        }
        
        
        return rusMult(a * 2, b / 2);
    }
}