How do I remove fungus on the lens?

I don’t think UV light will do it and a quick Google search indicates that common lens cleaning solutions, alcohol, and other obvious choices won’t work. I think you’ll find this article useful, and it has lots of comments which may shed extra light: https://petapixel.com/2016/09/29/remove-...

If the fungus is only on the an exposed glass surface then hopefully you can clean it without disassembly, but take care the cleaning solution doesn’t seep further into the lens.

Otherwise, disassembly may be an option but reassembly is likely to take a LOT of patience. My guide Canon PowerShot SX200 IS Lens Disassembly will give you an idea of what’s involved - Many compact camera lenses seem to be similar in construction.