Check if One String is a Rotation of Other String

Problem: Given two string s1 and s2 how will you check if s1 is a rotated version of s2 ?

If s1 = “crazyforcode” then the following are some of its rotated versions:



First need to check if s1 and s2 are of the same length.
Then check, if s2 is a substring of s1 concatenated with s1.

boolean checkRotation(string s1, string s2) 
	if(s1.length() != s2.length())
		return false;
	if( substr(s2,concat(s1,s1))
		return true;
	return false;

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