Burn Instruction

Permanently destroys tokens by removing them from circulation. This reduces the total supply of the token.

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

• Initialized a Mint account.
• A Token account or Associated Token account that already has at least the amount we want to burn.

The amount of tokens we burn are "normalized" for decimals. This means that if we want to burn 1 token that has 6 decimals, we'll need to actually put 1_000_000 as amount

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

burn(
    CpiContext::new(
        ctx.accounts.token_program.to_account_info(),
        Burn {
            mint: ctx.accounts.mint.to_account_info(),
            from: ctx.accounts.token_account.to_account_info(),
            authority: ctx.accounts.authority.to_account_info(),
        },
    ),
    &1_000_000,
)?;