Update README.md

README.md

@@ -174,8 +174,8 @@ When learning CS there are some useful sites you must know to get always informe
   * [Search Open Source Java API ](http://www.docjar.com/) : view source of java library and learn how things are implemented.
   * [JournalDev - Java, Java EE, Android, Web Development Tutorials](http://www.journaldev.com/)
   * [Implementation of Algorithms and Data Structures, Interview Questions and Answers ](https://github.com/sherxon/AlgoDS)
-  * [https://plumbr.eu/handbook/what-is-garbage-collection]()
-  * [https://javahungry.blogspot.com/2014/02/best-books-for-learning-java-must-read.html]()
+  * [what-is-garbage-collection](https://plumbr.eu/handbook/what-is-garbage-collection) : Demystify the garbage collection
+  * [Best books for learning java must read](https://javahungry.blogspot.com/2014/02/best-books-for-learning-java-must-read.html): Get basics of Java
   * [Garbage collection (Java); Augmenting data str (video)](https://www.youtube.com/watch?v=StdfeXaKGEc&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=25)
   * [Compilers (video)](https://www.youtube.com/playlist?list=PLO9y7hOkmmSGTy5z6HZ-W4k2y8WXF7Bff)
   * [Deep Dive Java: Garbage Collection is Good!](https://www.infoq.com/presentations/garbage-collection-benefits)
@@ -304,6 +304,7 @@ When learning CS there are some useful sites you must know to get always informe
   * [Google Code Jam Practice and ](https://code.google.com/codejam/contests.html) : past contest problems for practice
   * [Sphere Online Judge (SPOJ) ](http://www.spoj.com/)
   * [Art of Problem Solving](https://artofproblemsolving.com/)
+
 # Computer Books
   * [IT eBooks - Free Download - Big Library  ](http://it-ebooks.info/) : website for downloading ebooks without any advertisement and instant downloads.
   * [github.com/vhf/free-programming-books ](https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md) : More than 500 free ebooks on almost any language you can think of
@@ -383,4 +384,4 @@ When learning CS there are some useful sites you must know to get always informe
   * [TestTube News](https://www.youtube.com/user/TestTubeNetwork/videos)
   * [Reddit the front page of the internet](http://reddit.com/)
 
-  ___Maintained with :heart: by sdmg15___
+  ___Maintained with :heart: by sdmg15 & al ___