https://github.com/Snailclimb/JavaGuide/blob/master/docs/dataStructures-algorithms/%E5%87%A0%E9%81%93%E5%B8%B8%E8%A7%81%E7%9A%84%E5%AD%90%E7%AC%A6%E4%B8%B2%E7%AE%97%E6%B3%95%E9%A2%98.md#1-kmp-%E7%AE%97%E6%B3%95
https://zhuanlan.zhihu.com/c_1039097450233057280
