update .gitignore and remove comments

Author: shenxianpeng

.gitignore

@@ -10,3 +10,4 @@ __pycache__
 venv
 result.txt
 testing/main.c
+*/*compile_commands.json

tests/test_clang_tidy.py

@@ -7,7 +7,6 @@
 
 @pytest.fixture(scope='function')
 def generate_compilation_database():
-    # Generate compilation database
     subprocess.run(['mkdir', '-p', 'build'])
     subprocess.run(['cmake', '-Bbuild', 'testing/'])
     subprocess.run(['cmake', '-Bbuild', 'testing/'])