--- /DoubleMetaphone.java	2023-07-05 02:32:44.586158104 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/language/DoubleMetaphone.java	2023-07-05 02:32:44.590158104 +0200
@@ -39,7 +39,7 @@
     /**
      * "Vowels" to test for
      */
-    private static final String VOWELS = "AEIOUY";
+private static final char VOWELS = "AEIOUY";
 
     /**
      * Prefixes when present which are not pronounced
