Note that the RSS_URI constant represents the default prefix, so an empty string is used as the prefix.

注意，RSS_URI常量代表默认前缀，因此一个空字符串用作前缀。

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A trie (the name comes from the word retrieval) is made up of a series of nodes where the descendants of a given node have the same prefix of the string associated with that node.

trie(此名源于单词retrieval)由一系列的节点组成，其中，一个给定节点的后代具有与该节点关联的相同的字符串前缀。

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This function is optimized as a very tight loop using string instructions with the repeat prefix.

使用带有repeat前缀的字符串指令将该函数优化成一个非常紧密的循环。

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