refactor: route handler, make it easier to understand

[ixartz]

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[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (91bf42e) 6.45% compared to head (e86f548) 6.61%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/app/[locale]/(unauth)/api/guestbook/route.ts	0.00%	15 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #240      +/-   ##
========================================
+ Coverage   6.45%   6.61%   +0.16%     
========================================
  Files         32      32              
  Lines        279     272       -7     
  Branches      19      19              
========================================
  Hits          18      18              
+ Misses       253     246       -7     
  Partials       8       8              

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[github-actions]

🎉 This PR is included in version 3.39.0 🎉

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