Please look at my mini-template

Hello!

I needed this functionality:
Given the input of a HEX number (example 2A32BF42)
I needed to split the string in such a way that a '/' is inserted
after every 2 characters except that
the '/' should NOT be added at the end of string.

So 2A32BF42 has to become 2A/32/BF/42

This had to be done in XSLT 1 because its for browser-based transformations.

I wrote a template for this and want to hear the opinion of the
experts. I just started learning XSLT about a week ago.
So what do you think?

Here it is:

<xsl:template name="hex2path">
        <xsl:param name="left" select="''"/>
        <xsl:param name="right"/>
        <xsl:choose>
            <xsl:when test="(string-length($right) > 2)">

                <xsl:call-template name="hex2path">
                    <xsl:with-param name="left">
                        <xsl:value-of select="concat($left,
concat(substring($right, 1, 2), '/'))"/>
                    </xsl:with-param>
					<xsl:with-param name="right">
						<xsl:value-of select="substring($right, 3)"/>
						</xsl:with-param>
                </xsl:call-template>

            </xsl:when>
            <xsl:otherwise>
                <xsl:value-of select="concat($left, $right)"/>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>