Close Account Instruction

Closes a token account and transfers its remaining SOL rent to a destination account. The token account must have zero balance unless it's a native SOL account.

From Token2022 it's possible to close a Mint account that has a supply of 0

Before we can mint any token, we'll need to already have:

• Initialized a Mint account
• Initialized a Token account or Associated Token account that doesn't have any token inside.

This is how the CPI to the close_account() instruction looks like:

close_account(
    CpiContext::new(
        ctx.accounts.token_program.to_account_info(),
        CloseAccount {
            account: ctx.accounts.token_account.to_account_info(),
            destination: ctx.accounts.authority.to_account_info(),,
            authority: ctx.accounts.authority.to_account_info(),
        },
    ),
)?;