/in/foo.cc: In function 'std::string addStrings(const std::string&, const std::string&, int)':
/in/foo.cc:45:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         int digit_a = (i < a_rev.size()) ? charToNum(a_rev[i]) : 0;
      |                        ~~^~~~~~~~~~~~~~
/in/foo.cc:46:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         int digit_b = (i < b_rev.size()) ? charToNum(b_rev[i]) : 0;
      |                        ~~^~~~~~~~~~~~~~