Error during Building and Testing New Lint

Hi, my rust best community. Again I am facing new error during writing new lint… (https://stuartcrust.com/categories/clippy/). error is shown below

anyone can help me… ?
PS. I am not sure should i post this error as a new topic or post in my previous topic (Error during Writing New Lint for Clippy). For that I am really sorry for inconvenience.

What is the return type of the .as_str()? It should be &str by standard convention, but str doesn’t have method .get() afaik.

I am following the link , mentioned earlier. all code is seems to b valid… but the problem with some borrow rules… I am not sure what we have to change in this code…Some of senior may guide me…