Method new

code/chapter09/blockchain/blockchain4/core/src/transaction.rs:17–33

(from: String, to: String,
               amount: u64, fee: u64,
               nonce: u64, sign: String)

impl Transaction {
    pub fn new(from: String, to: String,
               amount: u64, fee: u64,
               nonce: u64, sign: String) -> Self
    {
        let mut tx = Transaction {
            nonce,
            amount,
            fee,
            from,
            to,
            sign,
            hash:"".to_string(),
        };
        tx.set_hash();

        tx
    }

    pub fn set_hash(&mut self) {
        let txs_ser = serialize(&self);