824. Goat Latin

Original link ：824. Goat Latin

solution： Simulation question

class Solution {
public:
    string toGoatLatin(string sentence) {
        int n = sentence.length();
        string res = ""; // Define the return value 
        for(int i = 0,k = 0;i < n;i++){
            int j = i;
            while(j < n && sentence[j] != ' ') j++;
            k++;    // Indexes +1
            if(tolower(sentence[i]) == 'a' || tolower(sentence[i]) == 'e' || tolower(sentence[i]) == 'i' || tolower(sentence[i]) == 'o' || tolower(sentence[i]) == 'u'){
                res += sentence.substr(i, j - i);
                res += "ma";
                for(int i = 0;i < k;i++)
                    res += "a";
                if(j != n) res += " ";
            }
            else{
                res += sentence.substr(i + 1,j - i - 1);
                res += sentence[i];
                res += "ma";
                for(int i = 0;i < k;i++)
                    res += "a";
                if(j != n) res += " ";
            }
            i = j;
        }
        return res;
    }
};