Validating isbn 10 c advice dating sensible

The following function does just that: It removes all characters which are not allowed in a ISBN.

This makes use of Arrow-style function composition.

When the system calculate the check digit for 978168197271 it will come up with 8 as the check digit for that number.

It will compare 8 with 2 and know that a mistake of some sort has been made.

An ISBN-10 control digit is calculated by multiplying each digit with its one-based index and taking the remainder from the integer division by eleven.

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