XSLT convert XML document

I am trying task in XSLT - convert XML with nested elements to another XML.

I need this:

Convert from:

<example>
 <value>
  aaa
   <value>
    bbb
      <value>
       ccc
      </value>
   </value>
 </value>
</example>

To:

<example>
  <value>aaa</value>
  <value>aaa</value>
  <value>bbb</value>
  <value>bbb</value>
  <value>ccc</value>
  <value>ccc</value>
</example>

I have been trying find the solution, but I have only this:

    <xsl:template match="/">
      <exmaple>
         <xsl:apply-templates/>
      </exmaple>
    </xsl:template>

    <xsl:template match="//value/text()">

     <value><xsl:value-of select="."/></value>
     <value><xsl:value-of select="."/></value>

    </xsl:template>

Result (problem with empty tags):

<exmaple>
<value>
aaa
</value><value>
aaa
</value><value>
bbb
</value><value>
bbb
</value><value>
ccc
</value><value>
ccc
</value><value>
</value><value>
</value><value>
</value><value>
</value>
</exmaple>

Thanks.