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Replace "less" by "fewer" in exercise.md (#1769)

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Yannis Guyon 2024-01-30 15:53:42 +00:00 committed by GitHub
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src/testing/exercise.md
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@ -10,7 +10,7 @@ The [Luhn algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm) is used to
validate credit card numbers. The algorithm takes a string as input and does the
following to validate the credit card number:
- Ignore all spaces. Reject number with less than two digits.
- Ignore all spaces. Reject number with fewer than two digits.
- Moving from **right to left**, double every second digit: for the number
`1234`, we double `3` and `1`. For the number `98765`, we double `6` and `8`.