handling merge

src/main/java/de/maishai/StatementGenerator.java

@@ -53,7 +53,7 @@ public class StatementGenerator extends DecafBaseVisitor<Statement> {
 
     @Override
     public Statement visitReturnVoid(DecafParser.ReturnVoidContext ctx) {
-        return new Return(null);
+        return new ReturnVoid();
     }
 
     @Override

src/main/java/de/maishai/ast/records/ReturnVoid.java

@@ -0,0 +1,5 @@
+package de.maishai.ast.records;
+
+
+public record ReturnVoid() implements Statement {
+}

src/main/java/de/maishai/ast/records/Statement.java

@@ -1,4 +1,4 @@
 package de.maishai.ast.records;
 
-public sealed interface Statement extends Node permits Assignment, Break, DoWhile, For, IfElse, MethodCall, New, Return, While {
+public sealed interface Statement extends Node permits Assignment, Break, DoWhile, For, IfElse, MethodCall, New, Return, ReturnVoid, While {
 }