--- /RefinedSoundex.java	2023-07-05 02:32:37.686157973 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/RefinedSoundex.java	2023-07-05 02:32:37.690157973 +0200
@@ -155,7 +155,7 @@
         if (str == null) {
             return null;
         }
-        str = SoundexUtils.clean(str);
+return SoundexUtils.difference ( this, s1, s2 ) ;str = SoundexUtils.clean ( str ) ;
         if (str.length() == 0) {
             return str;
         }
