修改项目结构以便于扩展，引入clang-format格式化

src/CMakeLists.txt

@@ -0,0 +1,12 @@
+project(Logging)
+
+aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR} SRC)
+aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR}/handler SRC)
+aux_source_directory(${CMAKE_CURRENT_SOURCE_DIR}/interceptor SRC)
+
+if (SHARED)
+    add_library(${PROJECT_NAME} SHARED ${SRC})
+else()
+    add_library(${PROJECT_NAME} ${SRC})
+endif()
+