[Rails] Redirections, Duplicate Content & Permalinks

Hi,

Recently I've looked at trying to get a permalink system up to
increase my site's ranking in google (and to have nice looking URLs);
however I've been very worried about google and duplicate content.

I currently already have a "flaw" in my site, in which if you go to
mysite.com/tutorials/ID it will bring you to the same place as
mysite.com/categories/CatID/tutorials/TutID . I really need the
first one "/tutorials/TutID" to redirect to the second "/categories/
CatID/tutorial/TutID".
When I decide to then release this permalink thing, I will then have
URLs like this "/CatPerm/TutPerm", However I will then need the old
links "/categories/CatID/tutorials/TutID" and "/tutorials/TutID" to
redirect to "/CatPerm/TutPerm"..

I'm hesitant to release this permalink system because with multiple
pages of the same content google will think I have duplicate content..

What should I do? How should I approach this?

I still don't really know how to setup the permalink system (well I've
made "UrlExt" for categories, which will be thier "CatPerm"; but I
dont know how to implement this in routes.rb).

If you need anymore information please just ask,

Please Help,

-Joe

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