Update Till.cs #2
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In the addB function, I have rewrote the code to calculate the special needed. Basically, I think that we could combine the calculation for Special Item A and B in just one function(DiscountItems) because in general, ItemA and ItemB are similar to calculate. Furthermore, there is no calculation that used to make discount in ItemA.
Also, the function AddItemC isn't checked the maximum number of Items C, so I have updated this function. In the Total() function, I have added a variable that used to check the current number of item C.