## Cut Corners

### Instructions

Create a function for each rounding math functions:
- round (like `Math.round`)
- ceil (like `Math.ceil`)
- floor (like `Math.floor`)
- trunc (like `Math.trunc`)

Some restrictions apply:
- You may not use strings conversion to do it
- No bitwise operator


### Notions

- [https://devdocs.io/javascript/global_objects/math](https://devdocs.io/javascript/global_objects/math)


### Code provided
```js
Math.round = Math.ceil = Math.floor = Math.trunc = undefined
```