Fix Credit Card examples

Author: martin056

week01/03.FinalRound/CreditCard/README.md

@@ -2,19 +2,19 @@
 
 Implement a function, called `is_credit_card_valid(number)`, which returns True/False based on the following algorithm:
 
-* Each credit card number must contain odd count of digits.
-* We transform the number with the following steps (based on the fact that we start from index 0)
+- Each credit card number must contain odd count of digits.
+- We transform the number with the following steps (based on the fact that we start from index 0)
   - All digits, read from right to left, at even positions (index), **remain the same.**
   - Every digit, read from right to left, at odd position is replaced by the result, that is obtained from doubling the given digit.
-* After the transformation, we find the sum of all digits in the transformed number.
-* The number is valid, if the sum is divisible by 10.
+- After the transformation, we find the sum of all digits in the transformed number.
+- The number is valid, if the sum is divisible by 10.
 
-For example: `79927398713` is valid, bacause:
+For example: `79927398715` is valid, bacause:
 
-* When we double and replace all digits at odd position we get: `7 (18 = 2 * 9) 9 (4 = 2 * 2) 7 (6 = 2 * 3) 9 (16 = 2 * 8) 7 (2 = 2 * 1) 3`
-* The sum of all digits of the new number is 70, which is divisible by 10 => the card number is valid.
+- When we double and replace all digits at odd position we get: `7 (18 = 2 * 9) 9 (4 = 2 * 2) 7 (6 = 2 * 3) 9 (16 = 2 * 8) 7 (2 = 2 * 1) 5`
+- The sum of all digits of the new number is 90, which is divisible by 10 => the card number is valid.
 
 More examples:
 
-* `79927398713` is a valid number
-* `79927398715` is invalid number
+- `79927398713` is an invalid number
+- `79927398715` is a valid number