sol

Easy/Common_Divisor_Of_Two_Strings/Solution.cpp

@@ -5,4 +5,8 @@ public:
         str1.substr(0, gcd(size(str1),size(str2))) // whats being returned = SUBSTRING starting from 0 to the gcd ( COMMON DIVISOR FOR ) the size of str1 and str2
         : ""; // else return nothing
     }
-};
+};
+
+// if str1 = BoomBoom and str2 = Boom
+// Then str1 + str2 = BoomBoomBoom and str2 + str1 = BoomBoomBoom (they're the same) so we return the substring of str1 starting at 0 to the gcd of the size of str1 and str2
+// size of str1 = 8 and size of str2 = 4 so the gcd of 8 and 4 is 4 so we return the substring of str1 starting at 0 to 4 which is Boom