void scanFolder(const char *dirName) {
    if (DIR *pDIR = opendir(dirName)) {
        while (auto entry = readdir(pDIR)) {
            char *fileName = entry->d_name;
            if (strcmp(entry->d_name, ".") != 0 && strcmp(entry->d_name, "..") != 0) {
                if (isFolder(fileName)) {
                    //found another folder scan deeper
                    scanFolder(fileVector, fileName);
                } else {
                    //found a file
                    std::string str = dirName;
                    str.append("/").append(fileName);
                }
            }
        }

        closedir(pDIR);
    }
}