题目
Assume you have a method isSubstring which checks if one word is a substring of another. Given two strings, s1 and s2, write code to check if s2 is a rotation of s1 using only one call to isSubstring ( i.e., “waterbottle” is a rotation of “erbottlewat”). Assume you have a method isSubstrin
阅读背景：
【字符串】判断s2是否是s1的旋转字符串
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