Refactoring code

[heli-d-bhavsar]

I have done refactoring as part of the course assignment. I have analyzed my code using designateJava. My pull request includes the following types of refactoring Refactor using Extract Method, rename Variable, Pull up method, Move method/field, Extract class #1

[joney000]

@heli-d-bhavsar appreciated your efforts to clean up some of the very old and messy code snippets.
can we break this into smaller PRs rather than having single commit.
we have so many improvements which you have suggested. let's discuss each one in separate PR and let's merge them one by one.

[joney000]

here is what a single PR good to have: -

1. code change limited to one file\Algorithm only.
2. Respective changes in readme link (change in file name \ time-space complexity)
3. if it's an indent change have it in an independent separate commit.