Передать массив в функцию и вернуть из функции

#include "stdafx.h"
#include <fstream>
#include <iostream>
using namespace std;
 
void EnterMassive(double* Massive, int Count, const string FileName)
{
    const int MasSize = 10;
    double* Mas = (double*)malloc(MasSize * sizeof(double));
    ifstream File(FileName);
    int i = 0, count = 10;
    while (!File.eof())
    {
        File >> Mas[i];
        i++;
        if (i==count)
        {
            double* Array = (double *)malloc((count + MasSize) * sizeof(double));
            count += MasSize;
            memcpy(Array, Mas, count * sizeof(double));
            free(Mas);
            Mas = Array;
        }
    }
    Massive = (double*)malloc(i * sizeof(double));
    memcpy(Massive, Mas, i * sizeof(double));
    Count = i;
    /*for (size_t k = 0; k < i; k++)
    {
        cout << Mas[k]<<endl;
    }*/
    
}
void Multi(double* MasOne, const int CountOne, double* MasTwo, const int CountTwo, double* ResultMas)
{
    double* Mas = (double*)malloc((CountOne * CountTwo) * sizeof(double));
    for (size_t i = 0; i < CountOne * CountTwo; i++)
    {
        for (size_t j = 0; j < CountOne * CountTwo; j++)
        {
            Mas[i, j] = MasOne[i] * MasTwo[j];
        }
    }
    ResultMas = Mas;
}
 
void _tmain()
{
    setlocale(LC_ALL, "rus");
    int CountOne = 0, CountTwo = 0;
    double *MasOne = NULL, *MasTwo = NULL, *ResultMas = NULL;
    EnterMassive(MasOne, CountOne, "C:\\fileone.txt");
    EnterMassive(MasTwo, CountTwo, "C:\\filetwo.txt");
    Multi(MasOne, CountOne, MasTwo, CountTwo, ResultMas);
    for (size_t i = 0; i < CountOne*CountTwo; i++)
    {
        for (size_t j = 0; j < CountOne*CountTwo; j++)
        {
            cout << ResultMas[i, j] << " ";
        }
    }
    system("pause");
}