Step 1: Create the base class LibraryItem

# Step 1: Create the base class LibraryItem
class LibraryItem:
    def __init__(self, itemID, completionPercentage=0):
        self._itemID = itemID
        # Ensure completionPercentage is within 0-100
        if 0 <= completionPercentage <= 100:
            self._completionPercentage = completionPercentage
        else:
            self._completionPercentage = 0 # Default to 0 if invalid

    def get_itemID(self):
        return self._itemID

    def get_completionPercentage(self):
        return self._completionPercentage

    def set_completionPercentage(