int main(int argc,char *argv[])
{

   char *s1,*s2;
   s1 = malloc(100);
   snprintf(s1,100,"How are you");
   s2 = malloc(strlen(s1));
   strcpy(s2,s1);
   printf("%s %s",s1,s2);
   free(s1);
   free(s2);
}