VSCODE 配置用户代码片段：通过header添加避免重复包含问题。

   {
        "c c++ Header": {
            "scope": "c,cpp",
            "prefix": "header",
            "body": [
                "#ifndef __${TM_FILENAME_BASE/(.*)/${1:/upcase}/}_H__",
                "#define __${TM_FILENAME_BASE/(.*)/${1:/upcase}/}_H__",
                "",
                "$0",
                "",
                "#endif /* __${TM_FILENAME_BASE/(.*)/${1:/upcase}/}_H__ */"
            ],
            "description": "Add #ifndef,#define and #endif"
        }
    }