/in/foo.cc:151:34: warning: multi-character character constant [-Wmultichar]
  151 |     size_t space_pos = line.find('  ');
      |                                  ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:151:34: warning: overflow in conversion from 'int' to 'char' changes value from '8224' to '' '' [-Woverflow]