I'm looking for some source codes of games for "begginers" , doesn't matter what libraries are used as long as the code is C/C++. When I say for begginers I mean not very long code, I need something that covers the structure and logic of a game something that can open my horizons of how a game should be built..

You can find really good tutorials in this site: http://lazyfoo.net/tutorials/SDL/index.php

While I would recommend using Lazy Foo's tutorials for learning how to use SDL, it really isn't a good resource to learn how to structure a game.

You can find plenty of well-structured projects on Github. I would recommend:
https://github.com/christopho/solarus