Refactor Minimum Spanning Tree

[sozelfist]

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 95.42%. Comparing base (abff887) to head (a5b0712).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #837      +/-   ##
==========================================
- Coverage   95.44%   95.42%   -0.02%     
==========================================
  Files         316      316              
  Lines       22839    22759      -80     
==========================================
- Hits        21798    21718      -80     
  Misses       1041     1041              

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[sozelfist]

The CI is failing because of clippy errors.