Removes and returns the last element of this set.

Removes and returns the last element of this set.For hash sets removing an element at the end of the set has a time complexity of O(N), with N being the capacity of the set.

For tree sets removing an element at the end of the set has a time complexity of O(Log N), with N being the number of elements in the set.

**Parameters:****set**- The set to use**Returns:**- void * retptr != NULL: The element that was removed.

void * retptr == NULL: An error, see pbl_errno:

PBL_ERROR_OUT_OF_BOUNDS - This set is empty.

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