[ISSUE #9620] placeholder replacement string concatenation

[yx9o]

Fixes #9620 .

[codecov-commenter]

Codecov Report

❌ Patch coverage is 37.93103% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.96%. Comparing base (f40a69f) to head (14a79eb).
⚠️ Report is 129 commits behind head on develop.

Files with missing lines	Patch %	Lines
...main/java/org/apache/rocketmq/store/CommitLog.java	37.93%	17 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #9621      +/-   ##
=============================================
- Coverage      48.15%   47.96%   -0.20%     
+ Complexity     12083    12036      -47     
=============================================
  Files           1313     1313              
  Lines          92839    92839              
  Branches       11870    11870              
=============================================
- Hits           44710    44530     -180     
- Misses         42636    42783     +147     
- Partials        5493     5526      +33     

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