add clojure implementation

[cvanloo]

I'm very new to Clojure, so this probably isn't the most "idiomatic" solution -- thought I would give it a go anyway.

Any suggestions/criticism are welcome.

[Vikasg7]

@cvanloo I have added a Clojure implementation, you can check it out. it's very short and concise.

[cvanloo]

@cvanloo I have added a Clojure implementation, you can check it out. it's very short and concise.

Cool! Your implementation looks really clean. I didn't even know about the case function. Making the lexer a lazy-seq I found also impressing.

I'm closing this PR in favor of @Vikasg7 solution.

[cvanloo]

I've cleaned my solution up a bit, leaving this here for reference.