Task is to design and implement a Kotlin/Java framework which provides methods to perform this filtering. Assume that a credit card number is valid if:
- it contains only numbers and no leading 0
- it is 12-19 digits long
- it passes the Luhn check https://en.wikipedia.org/wiki/Luhn_algorithm. For credit card numbers, the Luhn check digit is the last digit of the sequence. In addition, connect to https://binlist.net API and put additional information about credit card in response to user of your framework.
| Card Number | Brand | Validity |
|---|---|---|
| 4929804463622139 | Visa | Valid |
| 4929804463622138 | Visa | Invalid |
| 6762765696545485 | Maestro | Valid |
| 5212132012291762 | MasterCard | Invalid |
| 6210948000000029 | China Union Pay | Valid |
- Kotlin
- Library + sample project
- Unit tests
- Documentation
- Without any 3-party libraries