gabi

#include <iostream>
using namespace std;

char * deleteAndReturnRepeatiing(char *, unsigned);
int main() {
    cout << "Enter your big number - between 20 and 50 nums: ";

    char * bigNum = new char [50];
    cin >> bigNum;
    deleteAndReturnRepeatiing(bigNum, 50);

    if (bigNum != nullptr)
    {
        delete[] bigNum;
        bigNum = nullptr;
    }
}

char * deleteAndReturnRepeatiing(char * bigNum, unsigned size)
{
    char * repeatingNums = new char[size];
    int count = 0;
    for (int i = 0; i < size; i++)
    {
        for (int k = 1; k < size; k++)
        {
            if (bigNum[i] == bigNum[k])
            {
                repeatingNums[count] = bigNum[i];
                count++;
                for (; k < size - 1; k++)
                {
                    // Assign the next element to current location.
                    bigNum[k] = bigNum[k + 1];
                }

                // Remove the last element as it has been moved to previous index.
                bigNum[size - 1] = 0;
                size = size - 1;
            }
        }
    }
    cout << "The repeating nums are: " << endl;
    for (size_t i = 0; i < count; i++)
    {
        if (repeatingNums[i] >= 48 && repeatingNums[i] <= 57)
        {
            cout << repeatingNums[i] << " ";

        }
    }
    cout << endl;

    cout << "The new big num without the repeating ones: " << endl;
    for (size_t k = 0; k < size; k++)
    {
        if (bigNum[k] >= 48 && bigNum[k] <= 57)
        {
            cout << bigNum[k] << " ";
        }
    }
    cout << endl;
    return repeatingNums;
}