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

typedef struct _contact {
    const char *prenom;
    const char *nom;
    const char *adresse;
} contact;

typedef struct _carnet {
    contact *contacts;
    size_t capacity;
    int count;
} carnet;

void extend_carnet (carnet *crt, unsigned int s);

carnet new_carnet (void) {
    carnet crt;
    crt.contacts = NULL;
    crt.capacity = 0;
    crt.count = 0;
    extend_carnet (&crt, 3);
    return crt;
}

void delete_carnet (carnet *crt) {
    if (crt->contacts != NULL) {
        free (crt->contacts);
        crt->contacts = NULL;
    }

    crt->capacity = 0;
    crt->count = 0;
}

void extend_carnet (carnet *crt, unsigned int s) {
    crt->capacity += s;
    crt->contacts = realloc (crt->contacts,
        crt->capacity*sizeof (*crt->contacts));
}

void show_carnet (const carnet *crt) {
    int i;
    for (i=0; i < crt->count; i++) {
        printf ("Contact n°%i : %s\n", i+1,
            crt->contacts[i].prenom);
    }
}

void add_contact (carnet *crt, contact cnt) {
    if (crt->capacity == crt->count) {
        extend_carnet (crt, 3);
    }

    crt->contacts[crt->count] = cnt;
    crt->count++;
}

int main (int argc, char **argv) {
    carnet crt = new_carnet ();
    contact steven;
    steven.prenom = "StevenDeo";
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    add_contact (&crt, steven);
    show_carnet (&crt);
    delete_carnet (&crt);
    return 0;
}