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## Find Expression
### Instructions
Create a function named `findExpression` that takes a `number` as parameter and returns a `string` .
- 2 constant variables will be made available to your function: `add4` and `mul2` .
- Your goal is to try to find a sequence, starting from the number 1, and repeatedly either adding 4 or multiplying by 2, to produce the number given as a parameter.
- If the number can not be reached you should return `undefined`
For example, for the number `8` , you must first multiply by 2 twice, and then add 4. Your function should return something like: `1 *2 *2 +4` .
### Notions
- [Loops ](https://nan-academy.github.io/js-training/examples/loops.js )
- [Recursion ](https://nan-academy.github.io/js-training/examples/recursion.js )
### Code provided
> The provided code will be added to your solution, and does not need to be submitted.
```js
const add4 = '+4'
const mul2 = '*2'
```
