Hi @RohiniM - of course, the Tealium ecommerce extension takes care of all such minutia. However it takes some advance planning to get it into your profile if you've never used it before. Try to make some time to do so in the future because you'll find that it takes care of so much on almost every tag you'll ever use.
That said, you'll want to use an extension to append the leading semicolon to your product string. You should be able to use a Set Data Values extension to do something like
set productStringName to JS Code ";"+productStringName