/in/cipher.cpp: In function 'char IntToChar(std::__cxx11::string)':
/in/cipher.cpp:109:10: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
     ch = "K";
          ^~~
/in/cipher.cpp:127:10: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
     ch = "k";
          ^~~
/in/cipher.cpp: In function 'void handleErrors(int, char**)':
/in/cipher.cpp:190:14: error: 'isValidOption' was not declared in this scope
         if (!isValidOption(argv[i])) {
              ^~~~~~~~~~~~~
/in/compile/Makefile:23: recipe for target 'cipher.o' failed
make: *** [cipher.o] Error 1