Merge pull request fffaraz#1234 from abdullahilbaki/patch-1

Update books.md

Author: fffaraz

books.md

@@ -1,7 +1,7 @@
 
 ## C
 
-* [A Tutorial on Pointers and Arrays in C](http://home.netcom.com/~tjensen/ptr/pointers.htm)
+* [A Tutorial on Pointers and Arrays in C](https://sites.cs.ucsb.edu/~mikec/cs16/misc/ptrtut12/pointers.htm)
 * [Advanced Linux Programming](http://www.advancedlinuxprogramming.com/)
 * [Beej's Guide to C Programming](http://beej.us/guide/bgc/)
 * [Beej's Guide to Network Programming](http://beej.us/guide/bgnet/)