feat-insert-service (#5)

Reviewed-on: http://catelliub.zapto.org:3000/brontomark/flux/pulls/5
Co-authored-by: mark-cachy <marco@catelli.it>
Co-committed-by: mark-cachy <marco@catelli.it>

lib/core/utils/string_extensions.dart

@@ -19,4 +19,24 @@ extension MyStringExtensions on String? {
         })
         .join(' ');
   }
+
+  String fileExtension() {
+    if (this == null || this!.trim().isEmpty) return '';
+
+    final parts = this!.split('.');
+    if (parts.length < 2) return ''; // Nessuna estensione trovata
+
+    return parts.last.toLowerCase();
+  }
+
+  String fileNameWithoutExtension() {
+    if (this == null || this!.trim().isEmpty) return '';
+    this!.replaceAll(RegExp(r'[^a-zA-Z0-9\.\-]'), '_');
+    final parts = this!.split('.');
+    if (parts.length < 2) return this!; // Nessuna estensione trovata
+
+    return parts
+        .sublist(0, parts.length - 1)
+        .join('.'); // Ritorna tutto tranne l'ultima parte
+  }
 }