Error during Building and Testing New Lint

Hi, my rust best community. Again I am facing new error during writing new lint.. (clippy · stuart crust). 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....

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