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In my book a digit is a character as long as it is a string.
Punctuation is more tricky here, considering the name would be a part of the URL, but I see that nobody cared about this (including me)
You have a point here, this kata is not very precise.
They could've said "a alphabetical/numerical/alphanumerical.. string of length 6"
Create a function for generating a random 6 "character" string which will be used to access the photo URL.
The kata allows to use numbers in the string.
Why? It passed the test. I don't see that rule wich is against this solution. The kata needs a 6 character long string, and the numbers are characters.