/in/cipher.cpp: In function 'std::__cxx11::string getinput()':
/in/cipher.cpp:23:18: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     while (start < input.size() && std::isspace(input[start])) {
            ~~~~~~^~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
/in/compile/Makefile:23: recipe for target 'cipher.o' failed
make: *** [cipher.o] Error 1