Trying to make a code, that will create a array of structures “simulating” a card whith to fields kind and size, write down this fields into txt file and fullfill another array of cards with data from that txt file

#include "deck.cpp"
#include <fstream>
#include <string>
using namespace std;

int main()
{
    setlocale(LC_ALL, "Rus");

    const int size = 36;
    deck col[size];
    char kind[4][13] = {"пики", "буби", "крести", "черви"};

    for (int i = 0; i < size; i++) {
        col[i].kind = kind[rand()%4];
        col[i].size = rand() % 13 + 2;
    }

    ofstream out;
    out.open("deck.txt");
    out.clear();

    for (int i = 0; i < size; i++) {
        out << col[i].kind+"n" << to_string(col[i].size)+"n";
    }

    deck sol[size]; 

    string line;
    ifstream in("deck.txt");
    int i = 0;
    while (getline(in, line, 'n')) {
        if (i % 2 == 0) {
            sol[i / 2].kind = line;
        }
        else {
            sol[(i - 1) / 2].size = stoi(line);
        }
        i++;
    }

}

evrything works “fine” until it’s time to take data from file. while block ignores/ i tried changing way of inputing data, even tried use excel insted of txt, but still i didn’t get where i mistaked