Add removal of duplicate spaces in input strings in MD_STD_IN

MD_STD_IN.php

@@ -78,6 +78,9 @@ final public static function sanitize_text($input):string {
             FILTER_FLAG_NO_ENCODE_QUOTES);
 
         if ($output === false) return "";
+        while (strpos($output, "  ") !== false) {
+            $output = str_replace("  ", " ", $output);
+        }
 
         return trim($output);