foo.cc: In function ‘std::string multiply(std::string, std::string)’:
foo.cc:23:14: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   23 |     while (i < result.size()  && result[i] == '0') ++i;
      |            ~~^~~~~~~~~~~~~~~
foo.cc: In function ‘std::string formatResult(std::string, int)’:
foo.cc:43:20: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::__cxx11::basic_string<char>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   43 |     if (decimalPos >= num.length())  {
      |         ~~~~~~~~~~~^~~~~~~~~~~~~~~