refactor: replace internal util package with ptr

[reugn]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.02%. Comparing base (476e28a) to head (74c04ee).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   88.02%   88.02%           
=======================================
  Files          18       18           
  Lines         685      685           
=======================================
  Hits          603      603           
  Misses         70       70           
  Partials       12       12           

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