foo.cc: In function 'int StringPatternMatch(std::string&, std::string&)':
foo.cc:21:13: warning: unused variable 'i' [-Wunused-variable]
   21 |         int i, j;
      |             ^
foo.cc:21:16: warning: unused variable 'j' [-Wunused-variable]
   21 |         int i, j;
      |                ^
foo.cc:22:13: warning: unused variable 'nIndexTag' [-Wunused-variable]
   22 |         int nIndexTag;
      |             ^~~~~~~~~
foo.cc: In function 'int main(int, char**)':
foo.cc:50:13: warning: unused variable 'nSubLength' [-Wunused-variable]
   50 |         int nSubLength = 0, nCount = 0, nPosition = 0;
      |             ^~~~~~~~~~
foo.cc:50:41: warning: unused variable 'nPosition' [-Wunused-variable]
   50 |         int nSubLength = 0, nCount = 0, nPosition = 0;
      |                                         ^~~~~~~~~

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