int* rotateLeft(int d, int arr_count, int* arr, int* result_count) {
    assert(result_count);
    *result_count = arr_count;
    
    //
    // Use extra memory to rotate an array
    // 1. copy into extra memory [0]..[d]
    // 2. then copy the rest of the array [d]..[end] into the [0] index
    // 3. then copy the extra memory bytes into rest of the main array
    //     starting from [d]
    //
    
    if (!arr_count || arr_count == 1 || !arr) return arr;

    int* extra = malloc(sizeof(int) * d);
    assert(extra);

    memcpy(extra, arr, d * sizeof(int));
    memcpy(arr, arr + d, sizeof(int) * (arr_count - d));
    memcpy(arr + arr_count - d, extra, d * sizeof(int));
    
    free(extra);
    return arr;
}