anagram_search.c : refactored

[christianbender]

Changes:

• I refactored the project.
  • I moved some parts from the main into extern functions like sort(...) or swap(...).
  • And removed useless variables from the main function.

[deepyadav442]

@christianbender It seems like there is some problem while building project.(Errors are coming due to OS conflicts,since travis is using ubuntu and there are codes which are using windows headers(in c/c++)).
https://travis-ci.org/OpenGenus/cosmos/jobs/380381202 logs are here
I have fixed some of them but its still not working.Can you help me out here.

[arnavb]

Please conform to our C style guide.