Separate stub files

[lan496]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 59.20000% with 51 lines in your changes missing coverage. Please review.

Project coverage is 90.05%. Comparing base (7e09d05) to head (a5481e3).

Files with missing lines	Patch %	Lines
moyopy/src/base/cell.rs	73.11%	25 Missing ⚠️
moyopy/src/base/operation.rs	25.00%	18 Missing ⚠️
moyopy/src/base/error.rs	0.00%	7 Missing ⚠️
moyopy/src/lib.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
- Coverage   90.06%   90.05%   -0.02%     
==========================================
  Files          42       44       +2     
  Lines        5599     5600       +1     
==========================================
  Hits         5043     5043              
- Misses        556      557       +1     

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