C++ bir dosyanın içine yazılan şeyleri alıp başka bir dosyaya yazmak

#include "iostream"
#include "fstream"
#include "string"
#include "iomanip"

using namespace std;

ofstream write;
ifstream read;
string line;
string str_calorie;
;



class product
{
public:
   
   
    float stock;
    float calorie;

    string prod_name;
    string prod_date;
    string exp_date;
    string str_stock;
    string str_calorie;

    int unit_type= 1;
   
public:



   
   
    void set_prod()
    {
        cout << "Enter product name" << endl;
        getline(cin, prod_name);
        cout << "Enter production date of product like this dd/mm/yyyy" << endl;
        getline(cin, prod_date);
        cout << "Enter production date of product like this dd/mm/yyyy" << endl;
        getline(cin, exp_date);
        cout << "To enter stock of product select stock unit" << endl << "For kg press 1" << endl << "For piece press 2" << endl;
        cin >> unit_type;
        switch (unit_type)
        {
            case 1:
                cout << "Enter stock" << endl;
                cin >> stock;
                str_stock = to_string(stock);
                str_stock.erase(5);
                str_stock.append(" kg");
                break;
               
            case 2:
                cout << "Enter stock" << endl;
                cin >> stock;
                str_stock = to_string(stock);
                str_stock.erase(5);
                str_stock.append(" piece");
                break;
               
            default:
                break;
        };
       
        cout << "Enter calorie of product" << endl;
        cin >> calorie;
        };
   
    void write_prod()
    {
        write.open("repo.txt");
        write << prod_name << endl;
        write << prod_date << endl;
        write << exp_date << endl;
        write << str_stock << endl;
        write << calorie << endl;
        write.close();
    };
   
    void read_prod()
    {
        read.open("repo.txt");
        read >> prod_name;
        read >> prod_date;
        read >> exp_date;
        read >> str_stock;
        read >> calorie;
        read.close();
    };
   
    void get_prod()
    {
        cout << prod_name << endl;
        cout << prod_date << endl;
        cout << exp_date << endl;
        cout << stof(str_stock) << endl;
        cout << calorie << endl;
        };
   
    ~product()
    {};
};
 

int main()
{
    product prod[100];
    int i = 0;
    int file_method;
    string deleted_item;
   
    write.open("repo.txt");
    write << "abc" << endl;
    write << "efg" << endl;
    write << "aaa" << endl;
    write << "gggg" << endl;
    write << "mmm" << endl;
    write.close();
   
    cout << "To add a new item press " << "1" << endl
         << "To delete an item " << "2" << endl;

    cin >> file_method;
   
    switch (file_method)
       
    {
        case 1:
            read.open("repo.txt");
            write.open("repo2.txt");
            while (!read.eof())
            {
                getline(read, line);
                prod[i].prod_name = line;
                getline(read, line);
                prod[i].prod_date = line;
                getline(read, line);
                prod[i].exp_date = line;
                getline(read, line);
                prod[i].str_stock = line;
                getline(read, line);
                prod[i].str_calorie = line;
                i++;
            };
           
            while (!write.eof())
            {
                write << prod[i].prod_name << endl
                << prod[i].prod_date << endl
                << prod[i].exp_date << endl
                << prod[i].str_stock << endl
                << prod[i].str_calorie << endl;
                i++;
            };
           
            read.close();
            write.close();
           

            break;
           
        case 2:
            cout << "Write an item wanted delete" << endl;
//            getline(cin, deleted_item);
            cin >>deleted_item;
            for(int i = 0 ; i < 2 ; i++)
            {
                if(prod[i].prod_name != deleted_item)
                {
                    read.open("repo.txt");
                    write.open("repo2.txt");
                    while (!read.eof())
                    {
                        getline(read, line);
                        prod[i].prod_name = line;
                        getline(read, line);
                        prod[i].prod_date = line;
                        getline(read, line);
                        prod[i].exp_date = line;
                        getline(read, line);
                        prod[i].str_stock = line;
                        getline(read, line);
                        prod[i].str_calorie = line;
                        i++;
                    };
                   
                   

                    while (!write.eof())
                    {
                        write << prod[i].prod_name << endl
                        << prod[i].prod_date << endl
                        << prod[i].exp_date << endl
                        << prod[i].str_stock << endl
                        << prod[i].str_calorie << endl;
                        i++;
                    };
                }
                write.close();
                read.close();
            };
            break;
           
        default:
            break;
    }
   
   


   
   
   
   
   





   

   

    return 0;
}