Refactor Segment Tree Implementation

[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 95.43%. Comparing base (3422002) to head (46b3405).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #835      +/-   ##
==========================================
+ Coverage   95.42%   95.43%   +0.01%     
==========================================
  Files         315      315              
  Lines       22806    22809       +3     
==========================================
+ Hits        21762    21768       +6     
+ Misses       1044     1041       -3     

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[sozelfist]

Can you have a look, @vil02?