Method delete

src/models/common.rs:526–530

(&self, k: &K)

    }

    pub fn delete(&self, k: &K) {
        let index = self.hash_key(k);
        let mut ht = self.hash_table_list[index].lock().unwrap();
        ht.remove(k);
    }

    pub fn lookup(&self, k: &K) -> Option<V>
    where