I am a student at Faculty of Electrical And Computer Engeneering, last year I studied C, and passed the exam achieveing mark 9 (i believe in your country it would be 'B'), so that tells you about my abilities for this kind of tasks... I also belive the price is minimal, and if all the projects are like this, i can do them in matter of hours, up to one day. I'm sending you source code for the tasks you uploaded.
Please see P.M.