Реализуйте программу «Заметки»

#include <string>
#include <iostream>
#include <filesystem>
namespace fs = std::filesystem;
int main()
{
    std::string path = std::filesystem::current_path();
    for (const auto & entry : fs::directory_iterator(path))
        if(std::string(entry.path()).find(".txt") != std::string::npos)
            std::cout << entry.path() << std::endl;
    
}

#include <iostream>
#include <filesystem>
#include <vector>
#include <string>
#include <algorithm>
#include <iterator>
#include <fstream> 
namespace fs = std::filesystem;
 
std::vector<std::string> get_notes(const std::string& dir = fs::current_path()){
    std::vector<std::string> notes_list;
 
    for (auto const& entry : std::filesystem::directory_iterator{dir}) 
        if (!entry.is_directory() && entry.path().extension() == ".txt")
            notes_list.push_back(entry.path().filename());
 
    return notes_list;
}
 
std::ostream& show_txtfile(std::ostream& out, std::string filename){
    std::string line;
    std::ifstream fin(filename);
    while(std::getline(fin, line))
        out << line << std::endl;
    return out;
}
 
int main(){
    auto notes = get_notes();
    for(const auto& note : notes){
        std::cout << note << " : " << std::endl;
        show_txtfile(std::cout, note);
    }
        
    //std::copy(notes.begin(), notes.end(), std::ostream_iterator<decltype(notes)::value_type>(std::cout, "\n"));
}

std::vector<std::string> get_notes(const std::string& dir = fs::current_path().string()){
    std::vector<std::string> notes_list;
 
    for (auto const& entry : std::filesystem::directory_iterator{dir}) 
        if (!entry.is_directory() && entry.path().extension() == ".txt")
            notes_list.push_back(entry.path().filename().string());
 
    return notes_list;
}

 entry.path().extension() == ".txt"

static_assert (std::is_same_v<fs::path::string_type, std::string>, "path::string_type not equal to string");