Reduce Redundancy: Remove unnecessary code

[saurabh-rahate]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.

This PR contains:

1. Removal of unnecessary String conversions
2. Removal of pointless boolean expressions
3. Simplification of conditional statements
4. Removal of redundant variables (variables that don't have any special meaning/ context while execution)
5. Removal of duplicate condition
6. Removal of unnecessary while loop
7. Removal of manual Min/Max calculation
8. Removal of unnecessary return statements
9. Removal of unnecessary call to String.format()
10. Removal of unnecessary type cast
11. Removal of unnecessary wrapping of primitives

[saurabh-rahate]

I've identified more improvements to repository, but do not want to flood this PR and make it difficult to review.
Let me know if I should

1. push those changes in this PR
   OR
2. open multiple small PRs .

[siriak]

@saurabh-rahate, option 2, please.