src/*: whitespaces
src/construct.cpp: added a note you explained in the youtube video
README.md: added eexplaination for "-o" flag

…he enums in src/construct_types.h

warning 2: functions missing return statements
warning 3: for loop index is of type int but is compared to a value of type size_t

…t. also it is used in src/construct_flags.cpp so i added declaration.

con_type looks like the token types while also being only used in the file itself so i renamed to _con_type.
apply_macro_to_token() is used only in the file itself, so i set it as static and removed it from the header.

cstring is included for strcmp. so I replaced it with std::string comparison.
boost is used for split, is_any_of, and to_lower. so I implemented the functionality we need.

… the types and functions you directly use, and not depend on the current header files to complete the needed includes.

for example: the file src/construct_flags.h only needs to know the type std::string, so only #include <string>, and since the function implementation appears in src/construct_flags.cpp, it also needs an #include <string>.
you should put that same include in both .h and .cpp files, since technically the .h file can be empty, then it won't have includes for arguments types, the .cpp has to do the includes.
explaination for the importance of this rule: i remember something like this: <string> under one compiler / operating system does #include <algorithm> inside the header, so the program in the story ran filne without noticing the need of direct #include <algorithm>. once the same code was compiled with a different compiler / OS, it failed compilation since <algorithm> was not included.

…hrow error;".

before, an error could go unnoticed, but now the program will end automatically (I didn't do try-catch)