can we write multiplication logic in sightly

Few JS files are not getting minified.Is there any way to check what is causing error for JS minification.

I Need to remove all 404 found errors from site.I am checking  in live publisher log in that I can see many not found errors. How can we reslove those errors. Example:Failed to load resource: the server responded with a status of 404 (Not Found) search.catalog.html:/content/***/en/resources/search.c...