Clean the code.

[Shivangi-ch]

Describe the bug

• Due to a lot of contributions, the code is messy right now. For example improper indentation, unesseccary spaces/tabs, lack of comments to explain the code and extra commented code.
• All this makes it difficult for beginner contributors to understand the code.
  So the code should be cleaned
  Additional context
  Please assign this to me under gssoc21.