How to convert hex string to string or ubytes? Thanks.

[FrankLike]

On Monday, 5 February 2018 at 09:45:11 UTC, tetyys wrote:
> On Monday, 5 February 2018 at 08:41:43 UTC, FrankLike wrote:

> Casting unknown bytes to string or char is unsafe, and 
> obviously some bytes can be invalid UTF8 sequences.

Thank you.I got my error.