func createIBANNumber() -> String {
        var IBAN = self.removedSpaces
        var chars = Array(IBAN)
        var charsIBAN = String()
        
        chars.removeSubrange(0...3)
        chars.append(Character(IBAN[0]))
        chars.append(Character(IBAN[1]))
        chars.append(contentsOf: "0")
        chars.append(contentsOf: "0")
        
        let stringNumber = ["A": "10", "B": "11", "C": "12", "D": "13", "E": "14", "F": "15", "G": "16", "H": "17", "I": "18", "J": "19", "K": "20", "L": "21", "M": "22", "N": "23", "O": "24", "P": "25", "Q": "26", "R": "27", "S": "28", "T": "29", "U": "30", "V": "31", "W": "32", "X": "33", "Y": "34", "Z": "35"]
        
        for i in 0..<chars.count {
            if let value = stringNumber[String(chars[i])] {
                charsIBAN += value
            } else {
                charsIBAN += String(chars[i])
            }
        }

        let iban = BigInt(charsIBAN)
        let a = iban! / 97
        let b = a * 97
        let k = iban! - b
        let c = 98 - k
        if c < 10 {
            IBAN = "0\(c)"
        } else {
            IBAN = "\(c)"
        }

        return IBAN
    }