/in/foo.cc: In function 'void reverseWord(std::string&, int)':
/in/foo.cc:7:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |     if (index >= word.size() / 2) return;
      |         ~~~~~~^~~~~~~~~~~~~~~~~~