Write a function that allocates memory for an integer array. The function takes as an argument an integer pointer, the size of the array, and newSize to be allocated. The function returns a pointer to the allocated buffer. When the function is first called, the size will be zero and a new array will be created. If the function is called when the array size is greater than zero, a new array will be created and the contents of the old array will be copied into the new array.

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