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unique-slug
===========
Generate a unique character string suitible for use in files and URLs.
```
var uniqueSlug = require('unique-slug')
var randomSlug = uniqueSlug()
var fileSlug = uniqueSlug('/etc/passwd')
```
### uniqueSlug(*str*) → String (32 chars)
If *str* is passed in then the return value will be its md5 digest in
hex.
If *str* is not passed in, it will be 16 bytes coverted into 32 hex
characters, generated by `crypto.pseudoRandomBytes`.
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