Merge pull request 'feat(challenge-6): completed challenge' (#6) from feature/challenge-6 into develop

Reviewed-on: #6

06-sum/index.js

@@ -1,4 +1,9 @@
 export function sum(values) {
   // implementar logica aqui
-  
-}
+  if (values.length === 0 || !values) return 0;
+
+  // acc é abreviação de accumulator(acumulador)
+  return values.reduce((acc, number) => {
+    return (acc += number);
+  }, 0);
+}