how to do zero width space in xsl , Apache fop

Whenever I am trying to use zero_width_space_1 , In PDF Marathi data breaks and did not show correct as I am expecting . But when I am comment code and uncomment code which is commnent in following code , expected output shows correctly, but issue occurs that words are overlapping.

How to do ???

XSL code is as follows :-

    <code>
     <xsl:template name="table_dynamic_columns_data">
            <xsl:param name="index"/>
            <xsl:param name="total"/>
            <fo:table-cell keep-together.within-column="always">
                <fo:block>
                    <xsl:call-template name="zero_width_space_1">
                        <xsl:with-param name="data">
                            <xsl:value-of select="*[position()=$index]"></xsl:value-of>
                        </xsl:with-param>
                    </xsl:call-template>
                    <!--<xsl:value-of select="*[position()=$index]"></xsl:value-of>-->
                </fo:block>
            </fo:table-cell>
    </xsl:template>

   <xsl:template name="zero_width_space_1">
    <xsl:param name="data"/>
    <xsl:param name="counter" select="0"/>
    <xsl:choose>
       <xsl:when test="$counter &lt; string-length($data)">
          <xsl:value-of select='concat(substring($data,$counter,1),"&#8203;")'/>
            <xsl:call-template name="zero_width_space_2">
              <xsl:with-param name="data" select="$data"/>
              <xsl:with-param name="counter" select="$counter+1"/>
            </xsl:call-template>
       </xsl:when>
       <xsl:otherwise>
       </xsl:otherwise>
    </xsl:choose>
   </xsl:template>
    </code>