// Push items to the vector
        VecPushBackR(&vec, item1);
        VecPushFrontR(&vec, item2);
        VecPushBackR(&vec, item3);

        int values[] = {10, 20, 30, 40, 50};
        for (int i = 0; i < 5; i++) {
            VecPushFrontR(&vec, values[i]);
        }

    /// FAILURE : Returns `NULL` otherwise.
    ///
    #define StrPushFront(str, chr) VecPushFrontR((str), (chr))
    
    ///