yumaojun03 34b21481e9 ```
docs(day04): 更新README目录结构

修复指针文档链接语法错误,添加结构体、指针、反射和条件语句的目录索引,
完善第4天学习内容的导航结构
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Description
No description provided
Readme 1.2 MiB
Languages
Go 88.3%
Shell 10.7%
Dockerfile 1%