Add a visible character after the generated URL

[shenchanran]

The generated URL now ends with all invisible characters, which may cause incomplete copying when shared with others. However, if you add some partial character to the end of the full URL, it will be restored to the full URL when the user copies it.

[XCanG]

I suggest to add a trailing slash, even now it would work and it make link look a bit more funny, for example, same link, but the difference with slash:

https://zws.im/‍󠁧󠁿󠁭󠁡󠁩‍ https://zws.im/‍󠁧󠁿󠁭󠁡󠁩‍/