string[] guest_list = {"Rebecca", "Nadia", "Noor", "Jonte"};
string[] rsvps = new string[10];
int count = 0;

// void RSVP(string name, int party_size, string allergies, bool invite_only) {
void RSVP(string name,
          int party_size = 1,
          string allergies = "none",
          bool invite_only = true) {
    if (invite_only) {
        bool found = false;
        foreach (string guest in guest_list) {
            if (guest.Equals(name)) {
                found = true;
                break;
            }
        }
        if (!found) {
            Console.WriteLine($"Sorry, {name} is not on the guest list");
            return;
        }
    }
    rsvps[count] = $"Name: {name}," +
                   $"\tParty Size: {party_size}," +
                   $"\tAllergies: {allergies}";
    count++;
}

void show_RSVPs() {
    Console.WriteLine("\nTotal RSVPs:");
    for (int i = 0; i < count; i++){
        Console.WriteLine(rsvps[i]);
    }
}

//RSVP("Rebecca", 1, "none", true);
RSVP("Rebecca");
RSVP("Nadia", 2, "Nuts");
//RSVP("Linh", 2, "none", false);
RSVP(name: "Linh", party_size: 2, invite_only: false);
RSVP("Tony", 1, allergies: "Jackfruit", invite_only: true);
RSVP("Noor", 4, invite_only: false);
RSVP("Jonte", 2, "Stone fruit", false);
show_RSVPs();