extension String {

    func htmlEscaped() -> String {
        replacingOccurrences(of: "&", with: "&")
            .replacingOccurrences(of: "\"", with: """)
            .replacingOccurrences(of: "'", with: "'")
            .replacingOccurrences(of: "<", with: "&lt;")
            .replacingOccurrences(of: ">", with: "&gt;")
    }

    var nonEmpty: String? {
        isEmpty ? nil : self
    }
}