[Extension] Remove unnecessary isDigit check from isOnlyEmoji

Signed-off-by: Sahil Kumar <[email protected]>

lib/src/extension.dart

@@ -3,9 +3,6 @@ import 'package:characters/characters.dart';
 
 final _emojis = Emoji.all();
 
-//https://pub.dev/documentation/quiver/latest/quiver.strings/isDigit.html
-bool isDigit(int rune) => rune ^ 0x30 <= 9;
-
 extension StringExtension on String {
   String capitalize() {
     return "${this[0].toUpperCase()}${this.substring(1)}";
@@ -18,15 +15,7 @@ extension StringExtension on String {
     final characters = this.trim().characters;
     if (characters.isEmpty) return false;
     if (characters.length > 3) return false;
-    final containsDigits = characters.any((c) => isDigit(c.runes.first));
-    if (containsDigits) return false;
-    return characters.every((c) {
-      return _emojis.firstWhere(
-            (Emoji emoji) => emoji.char.contains(c),
-            orElse: () => null,
-          ) !=
-          null;
-    });
+    return characters.every((c) => _emojis.map((e) => e.char).contains(c));
   }
 }