Hello World Meet coding standards

I have tried to apply coding standards and removed some unnecessary codes. Because, I believe that if beginners will use the wrong source and then they will learn wrong method to code with joomla! or contribute.  I found this when I was teaching joomla to 6 engineering students and I was recommending them to follow coding standards. 

I am sending Pull request against this "branch" but may be this PR need "new branch". Please forgive me if I did anything wrong.

Thanks.
@sneha1992p @priyanka21 @Ekta93 @irfanmomin @WasimMemon for your efforts.