DrinksCodable3.swift

class Beer: Drink {
    var alcohol_content: String

    private enum CodingKeys: String, CodingKey {
        case alcohol_content
    }

    required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.alcohol_content = try container.decode(String.self, forKey: .alcohol_content)
        try super.init(from: decoder)
    }
}