#include <stdio.h>
#include <string.h>
struct _Phone_Entry {
     const char *name; 
     const char *number; 
};
typedef struct _Phone_Entry Phone_Entry;
static Phone_Entry _start_entries[] = {
       { "Wolfgang Amadeus Mozart", "+01 23 456-78910" },
       { "Ludwig van Beethoven", "+12 34 567-89101" },
       { "Richard Georg Strauss", "+23 45 678-91012" },
       { "Heitor Villa-Lobos", "+34 56 789-10123" },
       { NULL, NULL }
}; 
static const char *_nicknames[] = {
       "mozzart",
       "betho",
       "george",
       "hector",
       NULL
};
static void
_phone_entry_free_cb(void *data)
{
   free(data);
}
{
   Phone_Entry **pe = (Phone_Entry **)key;
   const char *nick = data;
   printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
   
}
int
{
   int i;
   Phone_Entry *entry_vl = &_start_entries[3];
   Phone_Entry *p = NULL;
   char *nick = NULL;
   void *data;
   
   for (i = 0; _start_entries[i].name != NULL; i++)
     {
        p = &_start_entries[i];
                      strdup(_nicknames[i]));
     }
   printf("Phonebook:\n");
   printf("\n");
   
   if (nick)
     {
        printf("Printing entry.\n");
        printf("Name: %s\n", entry_vl->name);
        printf("Number: %s\n", entry_vl->number);
        printf("Nick: %s\n\n", nick);
     }
   
   printf("Hash entry successfully deleted? %d\n\n", r);
   
   p = &_start_entries[2];
                           strdup("el jorge"));
   free(nick);
   
   
   Phone_Entry *p1 = malloc(sizeof(*p1));
   p1->name = "Raul Seixas";
   p1->number = "+55 01 234-56789";
                        strdup("raulzito"));
   if (!nick)
     {
        printf("No previous nick found for Raul Seixas. ");
        printf("Creating new entry.\n");
     }
   else
     {
        printf("Old nick for Raul Seixas was %s\n", nick);
        free(nick);
     }
   printf("\n");
   
                        strdup("raulzao"));
   if (nick)
     {
        printf("Changing nick for Raul Seixas to raulzao. ");
        printf("Old nick was %s\n", nick);
        free(nick);
     }
   else
     {
        printf("No previous nick found for Raul Seixas. ");
        printf("Creating new entry.\n");
     }
   
   
   printf("Phonebook:\n");
   printf("\n");
   
   printf("Phonebook:\n");
     {
        Phone_Entry **pe = (Phone_Entry **)t->
key;
        printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
     }
   printf("\n");
   
   printf("List of names/numbers in the phone book:\n");
     {
        Phone_Entry **pe = (Phone_Entry **)data;
        printf("%s: %s\n", (*pe)->name, (*pe)->number);
     }
   printf("\n");
   
   printf("List of nicks in the phone book:\n");
     {
        nick = data;
        printf("%s\n", nick);
     }
   printf("\n");
   
   printf("There are %d items in the hash.\n\n",
   
   Phone_Entry *p2 = malloc(sizeof(*p2));
   p2->name = "Alceu Valenca";
   p2->number = "000000000000";
   printf("List of phones after change:\n");
   printf("\n");
   
   printf("There are %d items in the hash.\n\n",
   
   
   free(p1);
   free(p2);
}