series: Clarify edge case of zero-length substrings

exercism · Sep 24, 2023 · e675dcf · e675dcf
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+# Instructions append
+
+What do you expect the result to be if the length of the substrings is zero?
+There is no one right answer, but we expect you to output a number of empty strings:
+one more than the length of the input string.
+While not intuitive to everyone, this upholds the property that the number of substrings is one more than the length of the input string minus the length of the substrings.