implement method to generate an error prefix that mentions the line and column the error occured in

src/main/java/de/hsrm/compiler/Klang/helper/Helper.java

@@ -0,0 +1,7 @@
+package de.hsrm.compiler.Klang.helper;
+
+public class Helper {
+    public static String getErrorPrefix(int line, int col) {
+        return "Error in line " + line + ":" + col + " ";
+    }
+}