Okay, so I have two storyboards being incorporated into my code. One of them being the coffeeViewController, the other being the checkoutViewController. I have an array of doubles and different values incorporated into it. However, when I run the code, it shows the label that I want to edit as blank. Can someone tell me how to fix this?

This code is on my coffeeViewController

var total:[Double] = []

@IBAction func action(_ sender: Any) {
    
    func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        let sum = total.reduce(0,+)
        let number = "\(sum)"
        let lvc = segue.destination as! checkoutViewController
        lvc.am = number
    }
}

This code is on my checkoutViewController

var am = String()

override func viewDidLoad()
{
    super.viewDidLoad()
    amount.text = am
}