p-token: Allow withdraw excess lamports from mint without authority #51
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Problem
Currently there is no mechanism to withdraw excess lamports from mint accounts with no authority. In such scenarios, #48 proposes to allow the mint keypair to withdraw the excess lamports.
Solution
This PR updates the
withdraw_excess_lamportsinstruction to allow withdraw when the authority is the same as the mint, it is a signer and the mint does not have an authority.