feat: add hints for extreme concatenate (#116)

laike9m · Feb 2, 2024 · d3163d6 · d3163d6
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diff --git a/challenges/extreme-concatenate/hints.md b/challenges/extreme-concatenate/hints.md
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+- Check out [Concatenate](https://docs.python.org/3/library/typing.html#typing.Concatenate)
+- Omit the return type if you struggle with it