itoa function realization

itoa.c

char* itoa( int number)
{
    int count = 0;
    int copy = number;
    do {
        count++;
    } while ( copy /= 10 );

    char* result = (char*) calloc( number+1, 1);
    int i = count - 1;
    for ( ; i >= 0; i-- )
    {
        result[i] = number%10 + '0';
        number /= 10;
    }
    return result;
}