#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char fill(char **first, char **second)
{
   if (first)
     *first = strdup("first");

   if (second)
     *second = strdup("second");
}

int main(void)
{
   char *first, *second;

   fill(&first, &second);
   printf("%s %s\n", first, second);

   return 0;
}