foo.cc: In function 'int main()':
foo.cc:45:15: warning: unused variable 'ic' [-Wunused-variable]
   45 |   const char *ic = iname.c_str();
      |               ^~
foo.cc:47:15: warning: unused variable 'oc' [-Wunused-variable]
   47 |   const char *oc = oname.c_str();
      |               ^~

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