chore(style): improve slice declarations

[luoliwoshang]

https://github.com/luoliwoshang/llcppg/pull/new/refactor/slice-declarations-uber-guide

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.20%. Comparing base (3f82aa9) to head (1981dd0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #519   +/-   ##
=======================================
  Coverage   84.20%   84.20%           
=======================================
  Files          27       27           
  Lines        2747     2747           
=======================================
  Hits         2313     2313           
  Misses        391      391           
  Partials       43       43           

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