Rustlings in VSCode

How to run rustlings in VSCode?

I'd assume you open a terminal in VS Code and execute rustlings from there. Beside this, the recommendation from the rustlings repo is to install the rust-analyser plugin.

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Where can I write code to complete the task?

I never did the rustlings exercises and I don't use VS Code, but AFAIK, when you run ./rustlings, it will open in watch mode, looking for changes to the source files of the exercises, recompiling them when you safe your changes to disk. So just saving the file when you are done editing in VS Code should be enough to get the feedback from rustlings.