First congratulations for creating this plugin.
But I wonder why this plugin is created !
This plugin does no more functionality than adding link to the hashtag I added #ankit and it shows me link http://localhost/blogging/?s=%23ankit. Then I disabled your plugin and hit the same url and result was same as previous one.
My suggestion is that, it will be of better use if you can rewrite the url for example. instead of http://localhost/blogging/?s=%23ankit
Thanks for your attention.