func (c *MergeCache) Delete(id int64) error {
	return c.Cache.Delete(fmt.Sprint(id))
}
func (c *MergeCache) Delete(id int64) error {
	return c.Cache.Delete(fmt.Sprint(id))
}
func ( c * MergeCache ) Delete ( id int64 ) error { return c . Cache . Delete ( fmt . Sprint ( id ) ) }
// Delete deletes a hashtree from the cache.
Delete deletes a hashtree from the cache .