Commit details:
- Set optimization level to O3 and include pedantic warnings in CXXFLAGS.
- Introduce separate build and source directories for better project organization.
- Add a target to run tests with the ENABLE_TESTS macro.
- Improve the 'all' target to create the build directory before building the executable.
- Introduce a 'rebuild' target for cleaning and rebuilding the project.
Changes made in Makefile:
- Update CXXFLAGS with -O3 and -pedantic.
- Introduce BUILD_DIR and SRC_DIR variables for better organization.
- Modifie SOURCE to point to the source file within the source directory.
- Update EXECUTABLE to exclude the file extension.
- Update 'all' target to create the build directory.
- Add 'test' target to run tests with the ENABLE_TESTS macro.
- Add 'rebuild' target for cleaning and rebuilding the project.
