Find why this helper can trap for ordinary input.
swift
struct User {
let email: String?
}
func normalizedEmail(for users: [String: User], id: String) -> String {
let user = users[id]!
return user.email!.lowercased()
}
Spot the bug in the email lookup
from Optionals Swift 6.3.3 intermediate 4 min 2 issues to find