Convert numbers in string from Arabic to Hindi

ArabicToHindiNumberConverter.swift

extension String {
    func convertToArbic () -> String? {
        let formatter = NumberFormatter()
        formatter.locale = Locale(identifier: "EN")
        guard let number = formatter.number(from:self ) else{
            return nil
        }
        formatter.locale = Locale(identifier: "AR")
        guard let number2 = formatter.string(from: number) else{
            return nil
        }
        return number2
    }
}