Need to call function from another php page

I have a php function that I want to call from another php file.  This function creates a button and places a message in Order Notes.  Also, the function isn't the only function in functions.php.

Here is the function

add_action ('woocommerce_before_order_notes', 'member_note', 10); 
function member_note (){
$code = <<< EOT
<button style= "background-color:green; color:white;" onclick="myFunctionMember()">MEMBERSHIP</button>
<script>
function myFunctionMember() {
    document.getElementById("order_comments").innerHTML = "I want membership";
}
</script>
EOT;
echo $code;
}

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This function needs to be at the bottom of this yellow box.  https://gyazo.com/fad06970c1cec8be092987e46331a7c3 which is being created with this code.  

<?php if (($val >= 100) && ($val <= 300)) { ?>
<p style="color: black; font-weight:bold; text-align:center; margin:0 auto; background-color: yellow; padding-top:6px; padding-bottom:6px; font-size:16px; font-family:Verdana, Arial, Helvetica, sans-serif;">
		<span class="heading">You've Qualified For FREE SmartStart Membership!</span><br />
		<br />
  $15 product credit for future use, shipping promotions and much more.</span>
	  <br /><br />
	Click The Green Membership Button To Recieve Your Membership Benefits</p>


<?php include('functions.php');
	$returning_value = member_note();								   
echo $returning_value;
 } ?>

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This code is at qv_contest.php

You can see my attempt that resulted in this error:

Fatal error: Cannot redeclare member_note() (previously declared in C:\xampp\apps\wordpress\htdocs\wp-content\themes\flatsome-child\functions.php:25) in C:\xampp\apps\wordpress\htdocs\wp-content\themes\flatsome-child\functions.php on line 33

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