Create a method that categorizes products based on price and weight following specific rules.

Rules:

  1. If the product is free (price = 0), categorize it as "Digital"
  2. 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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