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The first message you see is End of the trip for TurtleBot , which indicates that your code is going into the except section at the last 5 lines of your code:

if __name__ == '__main__':
    rospy.loginfo("End of the trip for TurtleBot")

Since this is getting into the except block, it means that there's some kind of exception being thrown in wall_follow(). I'd recommend that you either print the exception that's thrown, or remove the try/except block so that you can see where this exception is coming from.