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This is how we write code to add fund to a user in anchor solana project:

**user.to_account_info().try_borrow_mut_lamports()?+=amount;

Why is the "**" operator used here?

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If you look at the signature of try_borrow_mut_lamports()?, it returns a RefMut<.., &mut u64). The first * unwraps RefMut and the 2nd one de-references the &mut so you can mutate the underlying value.

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