Implement StringTag, run autofix

lib/nbt/Tag.dart

@@ -12,6 +12,7 @@ import 'Stream.dart';
 import 'impl/ByteTag.dart';
 import 'impl/ListTag.dart';
 import 'impl/LongArrayTag.dart';
+import 'impl/StringTag.dart';
 
 enum TagType {
   End(0),
@@ -59,7 +60,7 @@ abstract class Tag {
   static Tag readNamedTag(ByteLayer data) {
     var type = data.readByte();
     if (type == 0) {
-      return new EndTag();
+      return EndTag();
     } else {
       Tag tag = makeTagOfType(TagType.get(type));
       tag._key = data.readString();
@@ -78,63 +79,72 @@ abstract class Tag {
   }
 
   bool equals(dynamic object) {
-    if (object == null || !(object is Tag)) return false;
+    if (object == null || object is! Tag) return false;
 
     Tag tag = object;
     if (tag.getType() != getType()) return false;
 
-    if (getKey() == null && tag.getKey() != null ||
+    if (!(getKey() == tag.getKey())) return false;
-        tag.getKey() == null && getKey() != null) return false;
-
-    if (getKey() != null && !(getKey() == tag.getKey())) return false;
 
     return true;
   }
-  
+
   static Tag makeTagOfType(TagType type) {
     switch (type) {
       case TagType.Byte:
         {
-          return new ByteTag();
+          return ByteTag();
         }
       case TagType.ByteArray:
         {
-          return new ByteArrayTag();
+          return ByteArrayTag();
         }
 
       case TagType.Compound:
         {
-          return new CompoundTag();
+          return CompoundTag();
         }
       case TagType.Double:
         {
-          return new DoubleTag();
+          return DoubleTag();
         }
       case TagType.End:
-        return new EndTag();
+        {
+          return EndTag();
+        }
       case TagType.Short:
-        return new ShortTag();
+        {
+          return ShortTag();
+        }
       case TagType.Int:
-        return new IntTag();
+        {
+          return IntTag();
+        }
       case TagType.Long:
-        return new LongTag();
+        {
+          return LongTag();
+        }
       case TagType.Float:
-        return new FloatTag();
+        {
+          return FloatTag();
+        }
       case TagType.IntArray:
         {
-          return new IntArrayTag();
+          return IntArrayTag();
         }
       case TagType.LongArray:
         {
-          return new LongArrayTag();
+          return LongArrayTag();
         }
 
       case TagType.List:
         {
-          return new ListTag();
+          return ListTag();
+        }
+      case TagType.String:
+        {
+          return StringTag();
         }
-      }
     }
   }
-
 }

lib/nbt/impl/ByteArrayTag.dart

@@ -2,7 +2,7 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class ByteArrayTag extends Tag {
-  List<int> _value = [];
+  final List<int> _value = [];
 
   ByteArrayTag();
 

lib/nbt/impl/CompoundTag.dart

@@ -5,7 +5,7 @@ class CompoundTag extends Tag {
   late final Map<String, Tag> _value;
 
   CompoundTag() {
-    _value = new Map();
+    _value = <String, Tag>{};
   }
 
   @override
@@ -43,9 +43,9 @@ class CompoundTag extends Tag {
   }
 
   Tag? get(String name) {
-    if (contains(name))
+    if (contains(name)) {
       return _value[name] as Tag;
-    else {
+    } else {
       // Does not exist!
       return null;
     }

lib/nbt/impl/IntArrayTag.dart

@@ -2,7 +2,7 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class IntArrayTag extends Tag {
-  List<int> _value = [];
+  final List<int> _value = [];
   IntArrayTag();
 
   IntArrayTag._(List<int> value) {

lib/nbt/impl/LongArrayTag.dart

@@ -2,7 +2,7 @@ import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
 class LongArrayTag extends Tag {
-  List<int> _value = [];
+  final List<int> _value = [];
   LongArrayTag();
 
   LongArrayTag._(List<int> lst) {

lib/nbt/impl/StringTag.dart

@@ -1,18 +1,26 @@
 import 'package:libac_flutter/nbt/Stream.dart';
 import 'package:libac_flutter/nbt/Tag.dart';
 
-class TagString extends Tag {
+class StringTag extends Tag {
-  final String value;
+  String _value = "";
-  TagString({required this.value});
+  StringTag();
+
+  StringTag._(String str) {
+    _value = str;
+  }
+
+  static StringTag valueOf(String str) {
+    return StringTag._(str);
+  }
 
   @override
   void readValue(ByteLayer data) {
-    // TODO: implement readValue
+    _value = data.readString();
   }
 
   @override
   void writeValue(ByteLayer data) {
-    // TODO: implement writeValue
+    data.writeString(_value);
   }
 
   @override