/in/cipher.cpp: In function 'std::__cxx11::string decrypt(std::__cxx11::string, const char (*)[5], const char (*)[5], std::__cxx11::string)':
/in/cipher.cpp:121:26: error: 'size_typei' is not a member of 'std::__cxx11::string {aka std::__cxx11::basic_string<char>}'
         for(std::string::size_typei = 0; i < message.length(); i += 4){
                          ^~~~~~~~~~
/in/cipher.cpp:121:42: error: 'i' was not declared in this scope
         for(std::string::size_typei = 0; i < message.length(); i += 4){
                                          ^
/in/compile/Makefile:23: recipe for target 'cipher.o' failed
make: *** [cipher.o] Error 1