refactor(utils/body): shorten the code

[yusukebe]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.76%. Comparing base (e4cc5aa) to head (c461d11).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3353    +/-   ##
========================================
  Coverage   95.76%   95.76%            
========================================
  Files         151      151            
  Lines        9186     9186            
  Branches     2817     2714   -103     
========================================
  Hits         8797     8797            
  Misses        389      389            

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