Redirect old sites links to new one

Hi,

I have a website for 2 years now, one year ago i had my wordpress installation in a sub-directory called /wp.

So my articles that are more than one year old have external links to them like.. http://www.myurl.com/wp/some-kind-of-post/

Since i remove that /wp sub-directory one year ago only now i realized that external links that point to those posts do never arrive to the post, and maybe because of that i get penalized by google.

How can i do it, so that everybody arrives to the new url’s even through does external links pointing to my site.

htaccess redirection?

Sorry for my bad english,

Mario