etapa final de pregunta 2, C (gcc)

etapa final de pregunta 2

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

typedef struct
{
    char mail[321];
    char domain[256];
    
}domains;

// -----------------Prototypes----------------------

void findDomain ( char *, char *);
int compareDomains( const void *, const void * );
void lowerCase( char *);

// ---------------Main Program-----------------------
int main(void)
{
    domains typeDomain[10000];
    int i = 0, j;
    int total;
    unsigned short sum;

// --------------------------Input----------------------
    
    while ( i < 10000)
    {
        scanf("%320s", typeDomain[i].mail);
        if ( strcmp(typeDomain[i].mail, "FIN") == 0)
            break;
        i++;
    }
    
    // -----------------------Process-----------------------
    
    total = i;
    //printf("total: %d.\n\n", total);
    for (i = 0 ; i < total ; i++)
        findDomain(typeDomain[i].mail, typeDomain[i].domain);
    
    for (i = 0 ; i < total  ; i++)
        lowerCase(typeDomain[i].domain);
    
    /*
    for (i = 0 ; i < total  ; i++)
        printf("%s\n", typeDomain[i].domain);*/

qsort(typeDomain, total, sizeof(domains), compareDomains);
    
    printf("\nDOMINIOS ORDENADOS\n\n");
    
    for (i = 0 ; i < total ; i++)
        printf("%s\n", typeDomain[i].domain);
    
    printf("DOMINIOS DIFERENTES ENCONTRADOS\n");
    printf("===============================\n");
    for (i = 0 ; i < total - 1 ; i++)
    {
        sum = 1;
        for (j = i + 1 ; j < total ; j++)
        {
            if ( strcmp(typeDomain[i].domain, typeDomain[j].domain) == 0 )
                sum ++;
            else
                break;
        }
        printf("%s %hu\n", typeDomain[i].domain, sum);
        i = j - 1;
    }
        
        
    return 0;
}

/* -------------------------Procedimiento findDomain-------------------------------
 * Propósito: encontrar el dominio de un correo electrónico. Ejemplo: 
 * pedro@hotmail.com, el dominio es: hotmail.com 
 * 
 */

void findDomain ( char *mail, char *domain)
{
    char *pointer;
    pointer = mail;
    pointer = strchr(mail, '@');
    strcpy(domain, pointer + 1);
}

int compareDomains( const void *pivot, const void *element )
{
    domains *ptrPivot = (domains *) pivot;
    domains *ptrElement = (domains *) element;
    return strcmp( ( ptrPivot -> domain ), ( ptrElement -> domain ) );
}

void lowerCase( char *domain)
{
    while ( *domain != '\0')
    {
        if ( isupper( *domain ) )
            *domain = tolower(*domain);
        domain ++;
    }
}


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