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feat(solutions): add `is-prime-number/cs/function
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@ -6,7 +6,7 @@ Created by [@Divlo](https://github.com/Divlo) on 15 November 2020.
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Write a function that takes a string input, and returns the first character that is not repeated anywhere in the string.
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For example, if given the input `'stress'`, the function should return `'t'`, since the letter _t_ only occurs once in the string, and occurs first in the string.
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For example, if given the input `'stress'`, the function should return `'t'`, since the letter `'t'` only occurs once in the string, and occurs first in the string.
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If a string contains all repeating characters, it should return an empty string (`""`).
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