Uniformize folder structure (#693)

* Uniformize folder structure

* Fix icons

* Fix icons

* Fix tests

* Fix tests

front/src/utils/isNonEmptyArray.ts

@@ -0,0 +1,13 @@
+export function isNonEmptyArray<T>(
+  probableArray: T[] | undefined | null,
+): probableArray is NonNullable<T[]> {
+  if (
+    Array.isArray(probableArray) &&
+    probableArray.length &&
+    probableArray.length > 0
+  ) {
+    return true;
+  }
+
+  return false;
+}