Fix a link

free-programming-books.md

@@ -476,7 +476,7 @@
 * [The new C standard - an annotated reference](http://www.knosof.co.uk/cbook/cbook.html)
 * [Object Oriented Programming in C](http://www.planetpdf.com/codecuts/pdfs/ooc.pdf) (PDF)
 * [C Programming - Wikibooks](http://en.wikibooks.org/wiki/Programming:C)
-* [Deep C] (http://www.slideshare.net/olvemaudal/deep-c)
+* [Deep C](http://www.slideshare.net/olvemaudal/deep-c)
 
 
 ###C++