dealWithAllTheErrors.kt

data class BuyCryptoInfo(
  val username: String,
  val phoneNumber: PhoneNumber,
  val creditCard: CreditCard,
  val kycVerification: KycVerificationData){

  companion object{
      fun from1(user: CryptoUser): Result<BuyCryptoInfo> = with(user){
            val listOfErrors = mutableListOf<String>()

            if(phoneNumber == null) listOfErrors.add("missing phone number")
            if(creditCard == null) listOfErrors.add("missing credit card")
            if(kycVerification == null) listOfErrors.add("missing kyc verification")

            if(listOfErrors.size > 0) return Result.Error(listOfErrors.joinToString(","))

            return Result.Ok(BuyCryptoInfo(username, phoneNumber!!, creditCard!!, kycVerification!!))
      }
  }  
}