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## Sign
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### Instructions
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Create the `sign` function that takes one number argument
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and return 1 if the number is positive, -1 if the number is negative
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and 0 if the number is exactly 0
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You must not just use `Math.sign`, make your own.
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Create the `sameSign` function that takes 2 numbers as arguments and return true
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if they both have the same sign, or false otherwise.
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### Notions
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- [nan-academy.github.io/js-training/examples/functions.js](https://nan-academy.github.io/js-training/examples/functions.js)
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- [nan-academy.github.io/js-training/examples/if-else.js](https://nan-academy.github.io/js-training/examples/if-else.js)
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- [devdocs.io/javascript/global_objects/math/sign](https://devdocs.io/javascript/global_objects/math/sign)
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### Code provided
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> all code provided will be added to your solution and doesn't need to be submited.
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```js
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Math.sign = undefined
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```
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