Fix

src/main/java/systems/brn/chatencryptor/ChatDecryptorClient.java

@@ -19,7 +19,8 @@ public class ChatDecryptorClient implements ClientModInitializer {
                 if(message_content.startsWith("BRNCrypt:")){
                     String strippedMessage = message_content.replace("BRNCrypt:", "");
                     String decodedMessage = new String(Base64.getDecoder().decode(strippedMessage));
-                    String outputMessage = "Decoded:" + decodedMessage;
+                    assert sender != null;
+                    String outputMessage = "Decoded from " + sender.getName() + ":" + decodedMessage;
                     MinecraftClient.getInstance().inGameHud.getChatHud().addMessage(Text.of(outputMessage));
                     return false;
                 }

src/main/resources/chatencryptor.mixins.json

@@ -1,13 +0,0 @@
-{
-  "required": true,
-  "minVersion": "0.8",
-  "package": "systems.brn.chatencryptor",
-  "compatibilityLevel": "JAVA_17",
-  "mixins": [
-  ],
-  "client": [
-  ],
-  "injectors": {
-    "defaultRequire": 1
-  }
-}

src/main/resources/fabric.mod.json

@@ -20,9 +20,6 @@
       "systems.brn.chatencryptor.ChatDecryptorClient"
     ]
   },
-  "mixins": [
-    "chatencryptor.mixins.json"
-  ],
   "depends": {
     "fabricloader": ">=${loader_version}",
     "fabric": "*",