Improve bit manipulation algorithm implementations

[sozelfist]

Changes made:

• Add docstring to file and function
• Rewrite tests using macro

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.33%. Comparing base (63c4430) to head (cd17c1b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #788      +/-   ##
==========================================
- Coverage   95.34%   95.33%   -0.01%     
==========================================
  Files         310      310              
  Lines       22689    22657      -32     
==========================================
- Hits        21632    21600      -32     
  Misses       1057     1057              

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[sozelfist]

Can you have a look, @vil02?

Note: the CI Clippy step failed because of the new stable rust version

[vil02]

Note: the CI Clippy step failed because of the new stable rust version

This should be handled by #789.