Refactor RobotLangVisitorUser to remove unnecessary imports and clean up code

Q1/Artefacts/RobotLangVisitorUser.py

@@ -1,8 +1,4 @@
-from antlr4 import *
-if "." in __name__:
-    from .RobotLangParser import RobotLangParser
-else:
-    from RobotLangParser import RobotLangParser
+from RobotLangVisitor import RobotLangVisitor
 
 class RobotLangVisitorUser(RobotLangVisitor):
     def __init__(self, student_id="2320390"):
@@ -37,7 +33,4 @@ class RobotLangVisitorUser(RobotLangVisitor):
             # Visit all statements inside the repeat block
             for stat_ctx in ctx.stat():
                 self.visit(stat_ctx)
-        return None
-
-
-del RobotLangParser
+        return None