Check if country codes are valid in `get_most_viewed_per_country()`

[judith-bourque]

Country codes are provided in ISO 3166-1 alpha-2

See package ISOcodes

[judith-bourque]

Package ISOcodes doesn't work for me...

[judith-bourque]

To keep it simple, check that string provided contains only two capital letters

Functions

• [ ] is_two_capital_letters()
• [ ] error_not_two_capital_letters()