I don't know how to extract my applications to my internal storage

Hello good morning someone who can help me with a small problem. It’s that I want to make an application to extract applications, that is, an extractor apk, so I know how to bring up the list of my applications, but the only thing I couldn’t do is extract, that is, save the applications to my storage, that is, to my files. Someone who knows about this can help me please!

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