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

struct S { int i; };

char *
foo (char *p, char *r, struct S *w)
{
  char *q = malloc (strlen (p) + strlen (r) + 64);
  if (q == NULL) return NULL;
  strcpy (q, p);
  strcat (q, "/");
  strcat (q, "abcde");
  strcat (q, r);
  strcat (q, "/");
  return q;
}