remove unused files

[emar-kar]

Exported functions from those files are not used, and I don't see the point of keeping them.
I suggest we can remove them for clean-up?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.21%. Comparing base (746577b) to head (5f371ed).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   24.77%   25.21%   +0.43%     
==========================================
  Files          26       22       -4     
  Lines         787      714      -73     
==========================================
- Hits          195      180      -15     
+ Misses        575      517      -58     
  Partials       17       17              

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[WangYihang]

Some of the function is not used due to the lack of examples, I will provide more examples illustrating these functions.

[emar-kar]

I mean, what's the point of having them, if they are not actually part of the base functionality?