class Solution {
public:
string gcdOfStrings(string str1, string str2) {
string t = "";
for(int i = str1.size();i>=1;i--)
{
if(str1.size()%i == 0 && str2.size()%i == 0)
{
t = str1.substr(0,i);
string s1 = "";
string s2 = "";
for(int j = 0;j<str1.size()/i;j++) s1 += t;
for(int j = 0;j<str2.size()/i;j++) s2 += t;
if(s1 == str1 && s2 == str2) return t;
}
}
return "";
}
};
