Strip tag but preserve it's content

Clash Royale CLAN TAG#URR8PPP
Strip tag but preserve it's content
How do I strip tag name (if exists) preserving all of it's contents using XSLT 1.0?
name
input.xml:
<authors>
<author>
Author 1
</author>
<author>
<sup>*</sup>Author 2
</author>
<author>
<name>Author 3</name><sup>1</sup>
</author>
<author>
<sup>**</sup><name>Author 4</name><sup>2</sup>
</author>
</authors>
desired_output.xml:
<authors>
<author>
Author 1
</author>
<author>
<sup>*</sup>Author 2
</author>
<author>
Author 3<sup>1</sup>
</author>
<author>
<sup>**</sup>Author 4<sup>2</sup>
</author>
</authors>
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