leetcode 75 1768.Merge String Alternately

 class Solution {
public:
    string mergeAlternately(string word1, string word2) {
        string result="";
        for(int i=0;i<word1.length()&&i<word2.length();i++){
            result+=word1[i];
            result+=word2[i];
        }
        int index=min(word1.length(),word2.length());
        if(index==word1.length()){
            for(;index<word2.length();index++)
            {
                result+=word2[index];
            }
        }
        else{
             for(;index<word1.length();index++)
            {
                result+=word1[index];
            }
        }
        return result;
        
    }
};