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fix GenericStack.pop() and modify toString()#45
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1. Call list[size] should return null (if list[size-1] is the last element of the stack), this does not happen because the pop() method does not actually eliminate any element.2. When pop() is called, size should never be left with a negative value.
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Call
list[size]should returnnull(iflist[size-1]is the last element of the stack), this does not happen because thepop()method does not actually eliminate any element.When
pop()is called,sizeshould never be left with a negative value.