Improved code. Minor fixes

[lucasimi]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 90.38462% with 5 lines in your changes missing coverage. Please review.

Project coverage is 92.96%. Comparing base (5578d4a) to head (7534138).

Files with missing lines	Patch %	Lines
src/tdamapper/utils/heap.py	88.88%	3 Missing ⚠️
src/tdamapper/utils/vptree_hier/vptree.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   93.15%   92.96%   -0.19%     
==========================================
  Files          20       20              
  Lines        1066     1066              
==========================================
- Hits          993      991       -2     
- Misses         73       75       +2     

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