Update Makefile to improve formatting commands

- Modified format and format-check targets to use -print0 with xargs for better handling of filenames with spaces.
- Ensured consistent formatting checks across C and header files.

Author: ohkimur

Makefile

@@ -16,10 +16,10 @@ lint:
 	@echo "Lint passed!"
 
 format:
-	find . -name '*.c' -o -name '*.h' | xargs clang-format -i
+	find . \( -name '*.c' -o -name '*.h' \) -print0 | xargs -0 clang-format -i
 
 format-check:
-	find . -name '*.c' -o -name '*.h' | xargs clang-format --dry-run --Werror
+	find . \( -name '*.c' -o -name '*.h' \) -print0 | xargs -0 clang-format --dry-run --Werror
 
 check: format-check lint