what do you think you are being requested by your lecturer?
what do you think are the exposures of SQL injection
having established that what steps do you think you should put in place to reduce (and hopefully stop) SQL injection attacks?
we won't do your homework for you
we may help and assist you if you have made a significant effort to attempt the homework, but ultimately its for you to do yourself. passing off others efforts as your own is cheating, but ultimately its also cheating you yourself as you are failing to learn from the exercise