1768. Merge Strings Alternately

復盤, 就左右放, 放到完, 看code應該就能理解了

class Solution {
public:
    string mergeAlternately(string word1, string word2) {
        int i = 0;
        int j = 0;
        string res = "";
        while(i < word1.size() || j < word2.size()){
            if(i < word1.size()){
                res += word1[i];
                i++;
            }
            if(j < word2.size()){
                res += word2[j];
                j++;
            }
        }
        return res;
    }
};