void application()
{
    int randSize, i;

    srand((unsigned)time(NULL));
    randSize = (rand() % 15);

    char array[randSize];
    char *bar = array;

    for(i=0; i< randSize; i++)
            array[i] = 'x';

    printf("%s | ", bar);
}

char array[randSize + 1];

// loop to fill the array

array[i] = '';

printf("%s | ", bar);

char array[randSize + 1];
for (i=0; i < randSize; i++)
   array[i] = 'x';
array[i] = '';

char array[randSize];

char *array = malloc(randSize);