solves add digits

Author: anishLearnsToCode

src/AddDigits.java

@@ -0,0 +1,17 @@
+public class AddDigits {
+    public static int addDigits(int number) {
+        while (number > 9) {
+            number = sumDigits(number);
+        }
+        return number;
+    }
+
+    private static int sumDigits(int number) {
+        int sum = 0;
+        while (number > 0) {
+            sum += number % 10;
+            number /= 10;
+        }
+        return sum;
+    }
+}