solana-cli 3.1.12

Blockchain, Rebuilt for Scale
Documentation 
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use {solana_instruction::Instruction, solana_pubkey::Pubkey, spl_memo_interface::v3::id};

pub trait WithMemo {
    fn with_memo<T: AsRef<str>>(self, memo: Option<T>) -> Self;
}

impl WithMemo for Vec<Instruction> {
    fn with_memo<T: AsRef<str>>(mut self, memo: Option<T>) -> Self {
        if let Some(memo) = &memo {
            let memo = memo.as_ref();
            let memo_ix = Instruction {
                program_id: Pubkey::from(id().to_bytes()),
                accounts: vec![],
                data: memo.as_bytes().to_vec(),
            };
            self.push(memo_ix);
        }
        self
    }
}