func print<Target>(_ items: Any..., separator: String = default, terminator: String = default, to output: inout Target) where Target : TextOutputStream

func debugPrint<Target>(_ items: Any..., separator: String = default, terminator: String = default, to output: inout Target) where Target : TextOutputStream

func writeIntoFile() {
    if let documentDirectoryPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
        let filePath = documentDirectoryPath + "/logfile.txt"
        freopen(filePath.cString(using: .ascii), "a", stderr)
    }
}