Impl interpolation methods

[cpmech]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.94200% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 99.20%. Comparing base (e4090e6) to head (3f2b184).
Report is 162 commits behind head on main.

Files	Patch %	Lines
russell_lab/src/check/deriv1_central5.rs	97.36%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #94      +/-   ##
==========================================
+ Coverage   99.08%   99.20%   +0.11%     
==========================================
  Files         146      168      +22     
  Lines       32028    38147    +6119     
==========================================
+ Hits        31734    37842    +6108     
- Misses        294      305      +11     

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