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Fix link to Celsius conversion exercise #250

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Fix link to Celsius conversion exercise #250

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2 changes: 1 addition & 1 deletion book/error_handling/maybe.md
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Expand Up @@ -48,7 +48,7 @@ Try calling `String.toFloat` with other strings to see what happens ⬆️

Not all strings make sense as numbers, so this function models that explicitly. Can a string be turned into a float? Maybe! From there we can pattern match on the resulting data and continue as appropriate.

> **Exercise:** I wrote a little program [here](https://ellie-app.com/3P9hcDhdsc5a1) that converts from Celsius to Fahrenheit. Try refactoring the `view` code in different ways. Can you put a red border around invalid input? Can you add more conversions? Fahrenheit to Celsius? Inches to Meters?
> **Exercise:** I wrote a little program [here](https://ellie-app.com/8ZdSfFCpqrCa1) that converts from Celsius to Fahrenheit. Try refactoring the `view` code in different ways. Can you put a red border around invalid input? Can you add more conversions? Fahrenheit to Celsius? Inches to Meters?

[toFloat]: https://package.elm-lang.org/packages/elm-lang/core/latest/String#toFloat

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