ex3.o: In function `main':
/in/ex3.cpp:62: undefined reference to `decryptMessage(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool)'
collect2: error: ld returned 1 exit status
/in/compile/Makefile:17: recipe for target 'ex3' failed
make: *** [ex3] Error 1