code: func (m *MultiLRUCache) Init(buckets, bucket_capacity uint) {
  	m.buckets = buckets
  	m.cache = make([]*LRUCache, buckets)
  	for i := uint(0); i < buckets; i++ {
  		m.cache[i] = NewLRUCache(bucket_capacity)
  	}
  }
docs: // Using this constructor is almost always wrong. Use NewMultiLRUCache instead.