code: func (l *SimpleLRUCache) Delete(key Key) {
  	k := string(key.Hash())
  	element := l.elements[k]
  	if element == nil {
  		return
  	}
  	l.cache.Remove(element)
  	delete(l.elements, k)
  	l.size--
  }
docs: // Delete deletes the key-value pair from the LRU Cache.