Prettify code

[Perevalov]

Well structured code = well structured mind.

Please, refactor the code with respect to the following suggestions:

• Make consistent indentations in the files (https://google.github.io/styleguide/jsguide.html#formatting-block-indentation)
• Use standard naming convention (https://google.github.io/styleguide/jsguide.html#naming)

Also, please check the entire document for your information: https://google.github.io/styleguide/jsguide.html