build: refactor Makefile
- add character classes
- replace
echo -nwithprintf
Checklist
-
make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
echo -n with printf
make -j4 test (UNIX), or vcbuild test (Windows) passes