How do I split sourceName by '.' and take the last part?

[deerchao]

In my project template, I have a template.json:

{
  "sourceName": "MyPlugin",
  "...": "..."
}

and a MyPluginConfig.cs

namespace MyPlugin
{
    public class MyPluginConfig
    {
        // .....
    }
}

It worked great inside a folder named MyAwesomePlugin, the class generated is named MyAwesomePluginConfig.

But it won't compile used in folder My.Awesome.Plugin, because the generated class name My.Awesome.PluginConfig is not valid C# identifier.

Now, how do I get the last part of sourceName(Plugin in My.Awesome.Plugin), and use it to create a class named PluginConfig? Or is there a better way to work around this invalid identifier issue?

Thanks.