Method add_block

code/chapter09/blockchain/blockchain7/core/src/blockchain.rs:62–69

(&mut self, block: Block)

    }

    pub fn add_block(&mut self, block: Block) {
        Self::write_block(&mut (self.blocks_db), &block);
        Self::write_tail(&mut (self.blocks_db), &block);
        println!("New produced block saved!\n");
        self.curr_hash = block.hash.clone();
        self.curr_bits = block.header.bits.clone();
        Self::update_hmap(&mut self.blocks_index, block);
    }

    fn update_hmap(hmap: &mut Mutex<HashMap<String, Block>>, block: Block) {
        let mut hmap = hmap.lock().unwrap();