создание мусора

#include <iostream>
#include <Windows.h>
#include <string>
#include <fstream>

enum encode_mode {
    UTFtoWIN,
    WINtoUTF
};

std::string encoder(std::string text_to_encode, int encode_mode) {
    BSTR bstrWide;
    int length;
    char *text = new char[text_to_encode.size() + 1];
    for (int i = 0; i < text_to_encode.size(); i++) {
        text[i] = text_to_encode[i];
    }
    text[text_to_encode.size()] = '\0';
    if (encode_mode == encode_mode::UTFtoWIN) {
        length = MultiByteToWideChar(CP_UTF8, 0, text, strlen(text), NULL, NULL);
        bstrWide = SysAllocStringLen(NULL, length);
        MultiByteToWideChar(CP_UTF8, 0, text, strlen(text), bstrWide, length);
        length = WideCharToMultiByte(1251, 0, bstrWide, -1, NULL, 0, NULL, NULL);
        char *text_1251 = new char[length];
        WideCharToMultiByte(1251, 0, bstrWide, -1, text_1251, length, NULL, NULL);
        SysFreeString(bstrWide);
        text_to_encode.clear();
        for (int i = 0; i < strlen(text_1251); i++) {
            text_to_encode += text_1251[i];
        }
        delete[]text_1251;
    }
    else if (encode_mode == encode_mode::WINtoUTF) {
        length = MultiByteToWideChar(1251, 0, text, strlen(text), NULL, NULL);
        bstrWide = SysAllocStringLen(NULL, length);
        MultiByteToWideChar(1251, 0, text, strlen(text), bstrWide, length);
        length = WideCharToMultiByte(CP_UTF8, 0, bstrWide, -1, NULL, 0, NULL, NULL);
        char *text_u8 = new char[length];
        WideCharToMultiByte(CP_UTF8, 0, bstrWide, -1, text_u8, length, NULL, NULL);
        SysFreeString(bstrWide);
        text_to_encode.clear();
        for (int i = 0; i < strlen(text_u8); i++) {
            text_to_encode += text_u8[i];
        }
        delete[]text_u8;
    }
    delete[]text;
    return text_to_encode;
}

int main() {
    setlocale(LC_ALL, "ru");
    std::string path, dir;
    std::cout << "Путь до файла: ";
    SetConsoleCP(1251);
    std::getline(std::cin, path);
    SetConsoleCP(866);
    if (path[0] == '\"' && path[path.size() - 1] == '\"') {
        path.erase(0, 1);
        path.erase(path.size() - 1);
    }
    else if (path[0] == '\"') {
        path.erase(0, 1);
    }
    if (path[path.size() - 2] != '\\' && path[path.size() - 1] != '\\') {
        dir = path + "\\";
    }
    else {
        dir = path;
        path.erase(path.size() - 1);
    }
    system("cls");
    std::cout << "Расширение файлов: ";
    std::string file_expansion;
    std::cin >> file_expansion;
    if (file_expansion[0] != '.') {
        file_expansion.insert(0, ".");
    }
    system("cls");
    std::cout << "Количество файлов: ";
    int num_files;
    std::cin >> num_files;
    std::fstream write_fs;
    int point_end, delta_point;
    for (int i = 1; i <= num_files; ++i) {
        point_end = dir.size();
        dir += (std::to_string(i) + file_expansion);
        delta_point = dir.size() - point_end;
        write_fs.open(dir, std::fstream::out | std::fstream::app);
        write_fs << encoder("Файл №" + std::to_string(i), encode_mode::WINtoUTF);
        write_fs.close();
        dir.erase(dir.size() - delta_point);
    }
    return 0;
}