Create a method that categorizes products based on price and weight following specific rules.
Rules:
- If the product is free (price = 0), categorize it as "Digital"
- For products with a price greater than 0:
- If the weight is 0, categorize it as "Digital" (regardless of price)
- If the weight is less than or equal to 1 (kg), categorize it as "Light"
- If the weight is less than or equal to 10 (kg), categorize it as "Regular"
- If the weight is greater than 10 (kg), categorize it as "Heavy"
Examples:
Input: price = 0, weight = 5
Output: "Digital"
Explanation: Free products are always Digital
Input: price = 10, weight = 0.5
Output: "Light"
Explanation: Paid product with weight ≤ 1kg
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