Переведи код ниже с C на Nim. Используй библиотеку siwin.
```c
void change_window_text(HWND hwnd)
{
	static std::wstring s_old;
	wchar_t s[100];
	swprintf(s, 100, L"%d  %4.1e", all_tetron.size, mutator::get_main_scale());
	if (s_old == s) return;
	s_old = s;
	SetWindowText(hwnd, s);
}
```
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