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Simple card checker

Task definition.

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

Main features:

  • Kotlin
  • Library + sample project
  • Unit tests
  • Documentation
  • Without any 3-party libraries