int** copy_of(int** matrix, int n) {
    int** new_matrix = new int*[n];
    for (int row = 0; row < n; row++) {
        new_matrix[row] = new int[n];
        for (int col = 0; col < n; col++) {
            new_matrix[row][col] = matrix[row][col];
        }


         for (int row = 0; row < n; row++) {

        for (int col = 0; col < n; col++) {
            matrix[row][col] = new_matrix[col][row];
        }

    }
    return matrix;
}