/in/foo.cc: In function 'std::string removeLeadingZeros(std::string)':
/in/foo.cc:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     while (start < num.size() && num[start] == '0') {
      |            ~~~~~~^~~~~~~~~~~~
/in/foo.cc:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     if (start == num.size()) {
      |         ~~~~~~^~~~~~~~~~~~~