2259. Remove Digit From Number to Maximize Result

class Solution {
public:
    string removeDigit(string number, char digit)
     {
        string ans;

        int n = number.size();
        int i=0, index=-1;
        

        for(int i=0; i<n; i++)
        {
            if(number[i]==digit && (number[i+1]-'a')> (number[i]-'a')){
                ans = number.substr(0, i)+number.substr(i+1, n);
                return ans;
            }
            
            if(number[i]==digit)
                index = i;
        }

        ans = number.substr(0, index) + number.substr(index+1, n);

        return ans;
    }
};