Удаляем дубликаты в массиве

#include <iostream>
#include <utility>

using namespace std;

int remove_duplicates(int*, int);
int search_duplicat(int*, const int, int, int);
void remove_element(int*, const int, int);
void print(int*, const int);

int main() {
    const int buffer = 11;
    int arr[buffer] = { 1, 2, 1, 3, 2, 1, 2, 1, 2, 1, 2 };
    int size = buffer;
    print(arr, size);
    size = remove_duplicates(arr, size);
    print(arr, size);
    cin.get();
}

int remove_duplicates(int* arr, int size) {
    int index;
    for (int i = 0; i < size - 1; ++i) {
        for (int j = i + 1; j < size; ++j) {
            index = 0;
            while ((index = search_duplicat(arr, size, arr[i], j)) != -1) {
                if (index) {
                    remove_element(arr, size, index);
                    --size;
                }
            }
            if (index = -1) break;
        }
    }
    return size;
}

int search_duplicat(int* arr, const int size, int element, int beg) {
    if (beg >= size) return -1;
    do if (arr[beg] == element) return beg; while (++beg < size);
    return  -1;
}

void remove_element(int* arr, const int size, int index) {
    for (int i = index; i < size - 1; ++i) swap(arr[i], arr[i + 1]);
}

void print(int* arr, const int size) {
    for (int i = 0; i < size; ++i) cout << ' ' << arr[i];
    cout << endl;
}