public void Main()
{
var root = new Folder("root");
var user = new Folder("user");
var temp = new Folder("temp");
var document = new Folder("document");
var test = new File("test.xlsx");
var sample = new File("sample.docx");
var userName = new File("tanaka");
root.AddEntry(user);
root.AddEntry(temp);
user.AddEntry(document);
temp.AddEntry(test);
document.AddEntry(sample);
user.AddEntry(userName);
root.Output(0);
}