Create 1945. Sum of Digits of String After Convert

1945. Sum of Digits of String After Convert

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+class Solution {
+public:
+    int transform(int num){
+
+        int sum  = 0;
+
+        while(num>0){
+
+            int digit = num % 10;
+            sum += digit;
+            num /= 10;
+
+        }
+
+        return sum;
+
+    }
+    int getLucky(string s, int k) {
+
+        string str;
+
+        for (auto& c : s) {
+            str += to_string((c - 'a') + 1);
+        }
+
+        int sum = 0;
+        for (auto& digits : str) {
+            sum += digits - '0';
+        }
+
+        for(int i=1;i<k;i++){
+            sum = transform(sum);
+        }
+
+        return sum;
+    }
+};