Add e2ee settings

lib/utils/beautify_string_extension.dart

@@ -0,0 +1,15 @@
+extension BeautifyStringExtension on String {
+  String get beautified {
+    String beautifiedStr = "";
+    for (int i = 0; i < this.length; i++) {
+      beautifiedStr += this.substring(i, i + 1);
+      if (i % 4 == 3) {
+        beautifiedStr += "    ";
+      }
+      if (i % 16 == 15) {
+        beautifiedStr += "\n";
+      }
+    }
+    return beautifiedStr;
+  }
+}