Update free-programming-books.md

Removed duplicate Matters Computational entry and a link to a leaked pdf (seems like "Mastering Algorithms with C" isn't free at all)

free-programming-books.md

@@ -242,7 +242,7 @@
 * [Algorithms and Complexity](http://www.math.upenn.edu/~wilf/AlgoComp.pdf) (PDF)
 * [Algorithms and Data-Structures](http://www.ethoberon.ethz.ch/WirthPubl/AD.pdf) (PDF)
 * [Algorithms Course Materials](http://compgeom.cs.uiuc.edu/~jeffe/teaching/algorithms/) - Jeff Erickson
-* [Algorithms for Programmers: Ideas and Source Code](http://www.jjj.de/fxt/fxtbook.pdf) (PDF)
+* [Matters Computational: Ideas, Algorithms, Source Code](http://www.jjj.de/fxt/fxtbook.pdf) (PDF)
 * [Binary Trees](http://cslibrary.stanford.edu/110/BinaryTrees.pdf) (PDF)
 * [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/index.html)
 * [Data Structures and Algorithms: Annotated Reference with Examples](https://drive.google.com/file/d/0B48k2jhdQ5P2aVlmMFB1UUJLczA/edit?usp=sharing)
@@ -255,8 +255,6 @@
 * [Lectures Notes on Algorithm Analysis and Computational Complexity (Fourth Edition)](http://larc.unt.edu/ian/books/free/lnoa.pdf), University of North Texas (PDF)
 * [Linked List Basics](http://cslibrary.stanford.edu/103/LinkedListBasics.pdf) (PDF)
 * [Linked List Problems](http://cslibrary.stanford.edu/105/LinkedListProblems.pdf) (PDF)
-* [Mastering Algorithms with C](http://www.das.ufsc.br/~romulo/discipli/cad-fei/Mastering-Algorithms-with-C-Loudon.pdf) (PDF)
-* [Matters Computational](http://www.jjj.de/fxt/)
 * [Planning Algorithms](http://planning.cs.uiuc.edu/)
 * [Problems on Algorithms (Second Edition)](http://larc.unt.edu/ian/books/free/poa.pdf), University of North Texas (PDF)
 * [Programming Pearls](http://www.cs.bell-labs.com/cm/cs/pearls/) - Jon Bentley