Function darken

darken(hex: string, percent: number): string
Darkens a hex color by a given percentage.
Parameters
- hex: string
  The hex color string.
- percent: number
  The percentage to darken (0-100).
Returns string
A new hex color string.
Example: Imports
```
// ES Module
import { darken } from '@bnidev/js-utils'

// CommonJS
const { darken } = require('@bnidev/js-utils')
```
Example: Usage
```
darken('#ff0000', 20) // '#cc0000'
darken('#ffffff', 50) // '#808080'
```
- Defined in color/darken.ts:29