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Area Sum
The area of a rectangle is calculated by multiplying its height and width. For example, the area of a rectangle with a height of 3 and a width of 5 is:
3 * 5 = 15
Assignment
Complete the area_sum() function. It accepts a list of rectangles, where each rectangle is a dictionary that has the following structure:
rectangle: dict[str, int] = {"height": 5, "width": 6}
The function should calculate the area of each rectangle and return the sum of all the areas.