Beautiful Binary String

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    int beautifulBinaryString(string b) {
        int ptrn = 0;
        
        for (int i = 0; i<b.size(); i++){
            string sub = b.substr(i, 3);
            
            if(sub=="010"){
                ptrn++;
                i+=2;
            }
        }
        
        return ptrn;
    }