Check if strings are rotations of each other or not

Check if strings are rotations of each other or not
class Solution
{
    public:
    //Function to check if two strings are rotations of each other or not.
    bool areRotations(string s1,string s2)
    {
        // Your code here
        if(s1.length()!=s2.length()) return false;
    
        for(int i = s2.length() - 1 ; i >=0 ; i--){
            char ch = s2[s2.length()-1] ;
            s2.pop_back();
            s2 = ch + s2;
            if(s1 == s2)
                return true;
        }
        return false;
    }
};