Enhance RobotLang grammar and visitor to support student ID extraction

Q1/Artefacts/RobotLangVisitorUser.py

@@ -1,8 +1,14 @@
 from RobotLangVisitor import RobotLangVisitor
 
 class RobotLangVisitorUser(RobotLangVisitor):
-    def __init__(self, student_id="2320390"):
-        self.student_id = student_id
+    def __init__(self):
+        self.student_id = "Unknown"
+
+    def visitHeader(self, ctx):
+        # Extract the number directly from the script
+        self.student_id = ctx.NUMBER().getText()
+        # Continue walking the rest of the tree
+        return self.visitChildren(ctx)
 
     def visitMoveStat(self, ctx):
         val = ctx.NUMBER().getText()