string-trim

<xsl:include href="../plugins/tenandtwo-xslt-processor/xsl/string.xsl" />

<xsl:call-template name="string-trim">
    <xsl:with-param name="value" select="$value" />
</xsl:call-template>

also:
<xsl:call-template name="string-rtrim" />
<xsl:call-template name="string-ltrim" />

TEST 1 : PASS
string-trim :
– value = ‘ what’s. the fuss. ‘

result :
‘what’s. the fuss.’