unable to add element in xml using xslt

I am new to xslt. I have a small code snippet as below.

<users xmlns="ABC_Login">
   <email>ABC@gmail.com</email>
</users>

And I have xslt code is below.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://ift.tt/tCZ8VR"
xmlns:users= "ABC_Login"
xmlns= "ABC_Login" >
<xsl:output method="xml" indent="yes" encoding="UTF-8"/>
    <xsl:template match="//users">
<users>               
<email><xsl:value-of select="email"/></email>
</users>
</xsl:template>
</xsl:stylesheet>

The output is:

ABC@gmail.com

Expexted Output is:

<?xml version="1.0" encoding="UTF-8"?>
   <email>ABC@gmail.com</email>

Can anybody help me?