Check if a word is a substring of another string

Suppose a method issubstring. You can check whether a word is a substring of another string. Given two strings of S1 and S2. Write code to check if S2 is rotated S1, requiring only one issubstring to be called. (for example, Waterbottle is the string after the Erbottlewat rotation)

The above analysis is the solution to this problem: Call Issubstring directly (S1S1,S2).

BOOL Isrotation (string s1, string s2)
{
int len = S1.length ();
/* check if S1 and S2 are equal and not empty */
if (len = = S2.length () && len > 0)
{
/* stitching S1 and S2 into a new string */
String s1s1 = S1 + s1;
Return issubstring (S1S1, S2);
}
return false;
}

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Check if a word is a substring of another string