fix(cpp): add missing bracket in if condition and for loops

[SYaoJun]

fix: #899

Reason for this PR

What changes are included in this PR?

fix clang-tidy warnings

Are these changes tested?

yes

Are there any user-facing changes?

N/A

[codecov-commenter]

Codecov Report

❌ Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.60%. Comparing base (d535a43) to head (88de0b2).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
cpp/src/graphar/chunk_info_writer.cc	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #900      +/-   ##
============================================
+ Coverage     79.81%   80.60%   +0.78%     
  Complexity      615      615              
============================================
  Files            93       94       +1     
  Lines         10296    10707     +411     
  Branches       1055     1055              
============================================
+ Hits           8218     8630     +412     
+ Misses         1838     1837       -1     
  Partials        240      240              

Flag	Coverage Δ
cpp	70.89% <79.31%> (+0.09%)	⬆️

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