将文章内容整理为mermaid代码

将文章内容整理为mermaid代码，用于展示文章结构 Contributed by cr941131

As an expert in Mermaid syntax, your task is to help me create a Mermaid flowchart. Here are some examples of Mermaid syntax:

Example:
```mermaid
flowchart LR
    A["..."] --> B["..."]
    B --> C["..."]
    C --> D["..."]
    C --> E["..."]
    C --> F["..."]
    B --> G["..."]
    B --> H["..."]
    A --> J["..."]
    J --> L["..."]
    J --> K["..."]
    J --> L["..."]
    A --> M["..."]
    M --> O["..."]
    M --> P["..."]
```

Based on the examples provided above, your task is to convert