Newbie needs XSLT to generate specified output

For given billing.xml and address.xml, I need xslt to get output.xml.

Many thanks in advance!

========= billing.xml ==================

<?xml version="1.0" ?>
<!-- billing.xml -->

 <customer _name="test1">
   <current_charges>
     <phone_no>999-999-9999</phone_no>
     <local_calls>344</local_calls>
     <unit_price>0.05</unit_price>
     <line_charge>1000</line_charge>
     <ATT_units>101</ATT_units>
     <ATT_unit_price> 0.17 </ATT_unit_price>
     <misc_taxes> 5.95 </misc_taxes>
   </current_charges>
 </customer_name >

======== address.xml ===================
<?xml version="1.0"?>
<!--address.xml -->
<customer_name="test1">
  <street1> 999 Main St. #200 </street>
  <street2> </street2>
  <city> San Francisco </city>
  <state> CA </state>
  <country> USA </country>
</customer_name>

<phone_no="999-999-9999">
  <service_type> Plan_A </service_type>
  <provider> ATT</provider>
</phone_no>

========= output.xml ==================
<?xml version="1.0"?>
<!--output.xml -->
<customer_name="test1">
  <!--address information -->
  <street1> 999 Main St. #200 </street>
  <street2> </street2>
  <city> San Francisco </city>
  <state> CA </state>
  <country> USA </country>

  <current_charges>
    <phone_no>999-999-9999</phone_no>
    <service_type> Plan_A </service_type>
    <provider> ATT</provider>
    <local_calls>344</local_calls>
    <unit_price>0.05</unit_price>
    <line_charge>1000</line_charge>
    <ATT_units>101</ATT_units>
    <ATT_unit_price> 0.17 </ATT_unit_price>
    <misc_taxes> 5.95 </misc_taxes>
  </current_charges>

</customer_name>



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