If the index of the current letter is less than the length of the string, you invoke your named template again, passing the original string and incrementing the index by 1.

如果当前字母的下标小于字符串的长度，则再次调用已命名的模板，传递原始字符串并把下标加1。

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Reads the contents of the current node into a string with a given maximum length.

将当前节点的内容读入具有最大给定长度的字符串。

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The current implementation preserves the length of the string.

当前实现会保留字符串的长度。

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