Create a class represent a Node object that consist of value and next reference

Node.swift

class Node<Value> {
    var value: Value
    var next: Node<Value>?
    
    init(value: Value, next: Node<Value>? = nil ) {
        self.value = value
        self.next = next
    }
}

extension Node: CustomStringConvertible {
    var description: String {
        guard let next = next else {
            return "\(value)"
        }
        return "\(value) ->" + "\(next)"
    }
}