--- /RefinedSoundex.java	2023-07-05 03:07:05.050036498 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/RefinedSoundex.java	2023-07-05 03:07:05.054036497 +0200
@@ -138,7 +138,7 @@
 	 * @return A character (really a numeral) to return for the given char
 	 */
     char getMappingCode(char c) {
-        if (!Character.isLetter(c)) {
+if  ( ! ( isLetter ( c )  )  )  {     return 0; }
             return 0;
         }
         return this.soundexMapping[Character.toUpperCase(c) - 'A'];
