Improve Range Minimum Query 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 95.44%. Comparing base (ac0b333) to head (ddb2d6e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #834      +/-   ##
==========================================
+ Coverage   95.42%   95.44%   +0.01%     
==========================================
  Files         316      316              
  Lines       22754    22768      +14     
==========================================
+ Hits        21713    21730      +17     
+ Misses       1041     1038       -3     

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[sozelfist]

Can you have a look, @vil02?

[sozelfist]

Can you take a look, @vil02? This PR stayed here for a week.