advancements in tests and storing messages

back/utils/array.js

@@ -0,0 +1,13 @@
+function removeDuplicates(array) {
+    let unique = [];
+    for (let i = 0; i < array.length; i++) {
+        if (!unique.includes(array[i])) {
+            unique.push(array[i]);
+        }
+    }
+    return unique;
+}
+
+module.exports = {
+    removeDuplicates,
+};