Hello to all How can I index people on the list? To put the edit button and the favorit items for the list This method gives me an error : Fatal error: Unexpectedly found nil while unwrapping an Optional value

import SwiftUI

struct EditContact: View {

@Environment
(\.presentationMode) var presentationMode:Binding<PresentationMode>

@ObservedObject
 var CON : Contact

@State
 var act = false

    // id = UUID()
    var char : charContact
    var index: Int {
        http://CON.contact.firstIndex(where: { $0.id == http://char.id })!
    }

@State
 var active = false

    var body: some View {
        NavigationView {
            VStack {
                Image(systemName: "http://camera.circle.fill")
                    .padding()
                    .padding()
                    .padding()
                    .font(.system(size: 180))
                Spacer()
                VStack(alignment: .leading) {
                    HStack {
                        Text("Name")
                        Spacer()
                        TextField("\(http://self.char.name)", text: $CON.contact[self.index].name)
                            .padding()
                            .frame(width: 250, height: 40)
                            .border(Color.white, width: 1)
                    }.padding()
                    HStack {
                        Text("Title")
                        Spacer()
                        TextField("\(self.char.title)", text: $CON.contact[self.index].title)
                            .padding()
                            .frame(width: 250, height: 40)
                            .border(Color.white, width: 1)
                    }.padding()
                    HStack {
                        Text("Company")
                        Spacer()
                        TextField("\(http://self.char.company)", text: $CON.contact[self.index].company)
                            .padding()
                            .frame(width: 250, height: 40)
                            .border(Color.white, width: 1)
                    }.padding()
                    HStack {
                        Text("Email")
                        Spacer()
                        TextField("\(http://self.char.email)", text: $CON.contact[self.index].email)
                            .padding()
                            .frame(width: 250, height: 40)
                            .border(Color.white, width: 1)
                    }.padding()

                }
                Rectangle()
                    .frame(minWidth: 0, maxWidth: 380, maxHeight: 1)

                HStack {
                    Text("Mobile")
                    Spacer()
                    TextField("\(http://self.char.mobile)", text: $CON.contact[self.index].mobile)
                        .padding()
                        .frame(width: 250, height: 40)
                        .border(Color.white, width: 1)
                }.padding()

                Spacer()
                HStack {
                Button(action: {
                    if  http://self.CON.contact[self.index].name == "" && http://self.CON.contact[self.index].title == "" && http://self.CON.contact[self.index].company == "" && http://self.CON.contact[self.index].mobile == "" {
                        self.act = true
                    }
                }){
                    Text("Save")
                        .padding()
                        .frame(width: 150, height: 40)
                        .border(Color.white, width: 2)
                        .foregroundColor(.orange)
                }
                .padding()
                    Button(action: {
                        self.presentationMode.wrappedValue.dismiss()
                    }){
                        Text("Back")
                        .padding()
                        .frame(width: 150, height: 40)
                        .border(Color.white, width: 2)
                        .foregroundColor(.orange)
                    }
                }
                .alert(isPresented: $act) {
                    Alert(title: Text("Warning!!"), message: Text("Please enter the details you want to edit or press the Back button."))
                }

            }.navigationBarTitle("Edit contact",displayMode: .inline)

        }.colorScheme(.dark)
    }
}

var index: Int {
        http://CON.contact.firstIndex(where: { $0.id == http://char.id })!
    }