fix: change helper function to private

[hanxiao]

No description provided.

[codecov]

Codecov Report

Merging #151 (51d9713) into main (2916e9f) will not change coverage.
The diff coverage is 83.33%.

❗ Current head 51d9713 differs from pull request most recent head f1b06c9. Consider uploading reports for the commit f1b06c9 to get more accurate results

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   84.90%   84.90%           
=======================================
  Files          24       24           
  Lines        1166     1166           
=======================================
  Hits          990      990           
  Misses        176      176           

Flag	Coverage Δ
finetuner	84.90% <83.33%> (ø)

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Impacted Files	Coverage Δ
finetuner/tuner/__init__.py	81.81% <66.66%> (ø)
finetuner/tailor/__init__.py	95.23% <100.00%> (ø)

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