How i can put $_GET codes in function.php?

function custom_function_redirect() {
if ( isset( $_GET[ 'link' ] ) && $_GET[ 'link' ] != '' ) {
    wp_redirect( $_GET[ 'link' ], 301 );
}else{
    die('test');
 }
}

add_action('template_redirect','custom_function_redirect');

Try this it worked for me.

For redirection you should hook the function in template_redirect

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