wodencafe commented on a change in pull request #297:
URL: https://github.com/apache/commons-io/pull/297#discussion_r745848559



##########
File path: src/main/java/org/apache/commons/io/FilenameUtils.java
##########
@@ -201,7 +201,7 @@ public static String concat(final String basePath, final 
String fullFileNameToAd
         if (prefix < 0) {
             return null;
         }
-        if (prefix > 0) {
+        if (prefix > 0 && !fullFileNameToAdd.isEmpty() && '~' != 
(fullFileNameToAdd.charAt(0))) {

Review comment:
       @kinow @garydgregory Thank you for the feedback, I will test out the 
simplified change tonight and update the PR accordingly.




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