vin-checker

VIN Checker

In this Kata you should write a function to validate VINs, Vehicle Identification Numbers. Valid VINs are exactly 17 characters long, it's composed of capital letters (except "I","O" and "Q") and digits. The 9th character is a MODULUS 11 check digit. Here is how it works:

1. Letters are converted to numbers

Following the table bellow, letters are converted to numbers. "I","O" and "Q" are invalid characters.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
1 2 3 4 5 6 7 8   1 2 3 4 5   7   9 2 3 4 5 6 7 8 9

Ex.: VIN 5YJ3E1EA7HF000337 becomes 58135151786000337.

2. Each number is multiplied by a weight

The weights are the following: [8,7,6,5,4,3,2,10,0,9,8,7,6,5,4,3,2].

Ex.:
VIN:     5   Y   J   3   E   1   E   A   7   H   F   0   0   0   3   3   7
DECODED: 5   8   1   3   5   1   5   1   7   8   6   0   0   0   3   3   7
WEIGHTS: 8   7   6   5   4   3   2   10  0   9   8   7   6   5   4   3   2
PRODUCT: 40  56  6   15  20  3   10  10  0   72  48  0   0   0   12  9   14

3. All products are summed up

Ex.:
40+56+6+15+20+3+10+10+0+72+48+0+0+0+12+9+14 = 315

4. The modulus 11 of the sum is taken

Ex.:
315 mod 11 = 7

5. Check 9th character

If the 9th character matches the modulus 11, the VIN is valid.

Ex.:
5YJ3E1EA7HF000337 is a valid VIN, 9th character is 7

Note

If the modulus 11 of the sum is equal to 10, then the digit is "X".

Ex.: 
5YJ3E1EAXHF000347 is a valid VIN.

Input Validation

Input validation is part of the Kata, VINs with lengths different from 17 characters or containing invalid characters should return False as well.