how to find tag values with removing space

declare @x xml = '<XML> <UNSTRING STATEMENTNUMBER="48515">
          <STRING>CRD001M-OPTIONI</STRING>
          <DELIMITERS>
            <DELIMITER>aaa</DELIMITER>
          </DELIMITERS>
          <SUBSTRINGS>WS-MENU-STACK1 WS-MENU-STACK2 WS-MENU-STACK3 WS-MENU-STACK4 WS-MENU-STACK5 WS-MENU-STACK6 WS-MENU-STACK7 WS-MENU-STACK8 WS-MENU-STACK9 WS-MENU-STACK10 TALLYING IN WS-MENU-STACK-TALLY</SUBSTRINGS>
          <DELIMITERSFOUND>
            <DELIMITER>
            </DELIMITER>
          </DELIMITERSFOUND>
          <INDICES>
            <INDEX>
            </INDEX>
          </INDICES>
          <POINTER>
          </POINTER>
          <TALLYING>
          </TALLYING>
          <ONOVERFLOW>
          </ONOVERFLOW>
        </UNSTRING></XML>'

In above XML tag have value which are septate by space I am trying to make below string as below

declare @x xml = '<XML> <UNSTRING STATEMENTNUMBER="48515">
          <STRING>CRD001M-OPTIONI</STRING>
          <DELIMITERS>
            <DELIMITER>aaa</DELIMITER>
          </DELIMITERS>
            <SUBSTRINGS>WS-MENU-STACK1</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK2</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK3</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK4</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK5</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK6</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK7</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK8</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK9</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK10</SUBSTRINGS>
            <SUBSTRINGS>TALLYING</SUBSTRINGS>
            <SUBSTRINGS>IN</SUBSTRINGS>
            <SUBSTRINGS>WS-MENU-STACK-TALLY</SUBSTRINGS>
          <DELIMITERSFOUND>
            <DELIMITER>
            </DELIMITER>
          </DELIMITERSFOUND>
          <INDICES>
            <INDEX>
            </INDEX>
          </INDICES>
          <POINTER>
          </POINTER>
          <TALLYING>
          </TALLYING>
          <ONOVERFLOW>
          </ONOVERFLOW>
        </UNSTRING></XML>'

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Please help here how can I solve is issue by replace or any other thing I have used replace function but not able to find values here <substrings> tag values are septate by space, So find each value have between <substrings> value </substrings>