PropertyWrapper1.swift

@propertyWrapper struct Currency {
    var projectedValue: Bool

    // This is must stored property in every property wrapper
    var wrappedValue: String  {
        didSet {
            wrappedValue = "₹ " + wrappedValue
            projectedValue = wrappedValue.contains(",")
        }
    }
    
    init(wrappedValue: String) {
        projectedValue = wrappedValue.contains(",")
        self.wrappedValue = "₹ " + wrappedValue
    }
}