Predict the output??

#includestdio.h
int main()
{
    char s1[100]="Sookshmas",s2[100]="source";
    int length,j;
    length=0;
    while(s1[length]!='\0')
    {
        length++;
    }
    for(j=0;s2[j]!='\0';j++,length++)
    {
        s1[length]=s2[j];
    }
    s1[length]='\0';
    printf("After \n");
    puts(s1);
}