Simplify BBCode full linked from ImgBB

The function of this online utility is to simplify BBCode full linked from ImgBB.

For example,

[url=https://imgbb.com][img]https://i.ibb.co/aBC2deF/g.png[/img][/url]
[url=https://example.com/link-title]resource main page[/url]

will becomes:

[img]https://i.ibb.co/aBC2deF/g.png[/img]