Website for C debugging puzzles [closed]

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could you recommend some website for C debugging puzzles?

Thanks

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Take any subversion, git or other repo on the net, which contains a project written in C

Compile, run, break debug .... give back to the community. You will never run out of challenges

Here are some:

1. http://git.gnome.org/browse/
2. http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=summary
3. http://git.savannah.gnu.org/cgit/qemu.git
4. http://directory.fsf.org/GNU/

And millions more!