HighlightString.swift

    private func highlight(_ substring: String, in string: String, color: UIColor = UIColor(named: "Blue")!) -> NSAttributedString {
        let defaultAttributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14.0),
                                 NSAttributedString.Key.foregroundColor: UIColor.white]

        let text = NSMutableAttributedString(string: string, attributes: defaultAttributes)

        if let fillableRange = string.nsRange(of: substring) {
            text.addAttribute(NSAttributedString.Key.font, value: UIFont.boldSystemFont(ofSize: 14.0), range: fillableRange)
            text.addAttribute(NSAttributedString.Key.underlineColor, value: color, range: fillableRange)
            text.addAttribute(NSAttributedString.Key.underlineStyle, value: 1, range: fillableRange)
        }
        return text
//        fillableLabel.attributedText = text
    }