/in/foo.cc: In function 'void reverseStr(const std::string&, int)':
/in/foo.cc:6:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |     if (index == s.length()) {
      |         ~~~~~~^~~~~~~~~~~~~
/in/foo.cc: In function 'void processStrings(const std::string&, int, int, int)':
/in/foo.cc:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     if (index == strs.length()) {
      |         ~~~~~~^~~~~~~~~~~~~~~~
/in/foo.cc:23:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     if (index < strs.length() - 1) {
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~