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## Find Expression
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### Instructions
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Create a function called `findExpression` that takes a number as parameter and returns a string
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- It will be given two constant variable `add4` and `mul2`
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- Your goal is to try to find a sequence, starting from the number 1, and repeatedly either adding 4 or multiplying 2
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that produces the number given has parameter.
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For example, the number 8 you must first multiplying by 2 twice and then add 4.
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It will look something like this `1 *2 *2 +4`
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- If the number can not be reached you should return `undefined`
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### Notions
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- https://nan-academy.github.io/js-training/examples/loops.js
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- https://nan-academy.github.io/js-training/examples/recursion.js
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### Code provided
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```js
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const add4 = '+4'
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const mul2 = '*2'
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```
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