strncpy _ from_user函数将一个字符串从用户空间复制到一个内核缓冲区，给定一个用户空间源地址和最大长度。
The strncpy_from_user function copies a string from user space into a kernel buffer, given a user space source address and Max length.
将当前节点的内容读入具有最大给定长度的字符串。
Reads the contents of the current node into a string with a given maximum length.
翻译给定一个字符串，找出其没有重复字符的最大子序列的长度。
The translation given a string s, find the largest palindrome substring of it.
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