#include <stdio.h>
#include <string.h>
#include <stdlib.h> //EXIT_SUCCESS, calloc

struct A
{
 char *name;
 int id;
};

struct B
{
 char *buildingName;
 struct a *ptra;
};


int main()
{

   int employe = 1;
   int NrOfBuildinTemplates = 3;

   struct A *humans;
   struct B *buildings;

   humans =  calloc(employe, sizeof(struct A));
   buildings = calloc(NrOfBuildinTemplates, sizeof(struct B));

   buildings[0].buildingName = strdup("Building A");
   buildings[1].buildingName = strdup("Building B");
   buildings[2].buildingName = strdup("Building C");


   int count = 100, n = 0;
   for (size_t i = 3; i < count; i++)
   {
      buildings = realloc(buildings, i+1);
      buildings[i].buildingName = strdup("Building XYZ");
      buildings[i].ptra = (*buildings->ptra) calloc(1, buildings->ptra);
      buildings[i].ptra = &(humans[n]);
      buildings[i].ptra = strdup("NameXYZ");
      humans = realloc(humans, n+1);
      n++;
   }


   for (size_t i = 3; i < count; i++)
   {
      printf("%s -> %sn", buildings[i].buildingName, buildings[i].ptra->name);
      n++;
   }
 return 0;
}