StackOverflow fix switchexpression

src/main/java/de/dhbwstuttgart/parser/SyntaxTreeGenerator/StatementGenerator.java

@@ -324,7 +324,7 @@ public class StatementGenerator {
         throw new NotImplementedException();
     }
 
-    private Expression convert(Java17Parser.SwitchExpressionContext switchexpression) {
+    private Statement convert(Java17Parser.SwitchexpressionstmtContext switchexpression) {
         // TODO
         throw new NotImplementedException();
     }