rename package folders

packages/stream_chat_flutter/lib/src/extension.dart

@@ -0,0 +1,29 @@
+import 'package:emojis/emoji.dart';
+import 'package:characters/characters.dart';
+
+final _emojis = Emoji.all();
+
+extension StringExtension on String {
+  String capitalize() {
+    return "${this[0].toUpperCase()}${this.substring(1)}";
+  }
+
+  //  Emojis guidelines
+  //  1 to 3 emojis: big size with no text bubble.
+  //  4+ emojis or emojis+text: standard size with text bubble.
+  bool get isOnlyEmoji {
+    final characters = this.trim().characters;
+    if (characters.isEmpty) return false;
+    if (characters.length > 3) return false;
+    return characters.every((c) => _emojis.map((e) => e.char).contains(c));
+  }
+}
+
+/// List extension
+extension IterableX<T> on Iterable<T> {
+  /// Insert any item<T> inBetween the list items
+  List<T> insertBetween(T item) => expand((e) sync* {
+        yield item;
+        yield e;
+      }).skip(1).toList(growable: false);
+}