liquibase-core/src/main/java/liquibase/util/file/FilenameUtils.java
public static String getName(String filename) {
        if (filename == null) {
            return null;
        }
        int index = indexOfLastSeparator(filename);
        return filename.substring(index + 1);
    }
public static String getName(String filename) {
        if (filename == null) {
            return null;
        }
        int index = indexOfLastSeparator(filename);
        return filename.substring(index + 1);
    }
Gets the name minus the path from a full filename.
<p>
This method will handle a file in either Unix or Windows format.
The text after the last forward or backslash is returned.
<pre>
a/b/c.txt --> c.txt
a.txt     --> a.txt
a/b/c     --> c
a/b/c/    --> ""
</pre>
<p>
The output will be the same irrespective of the machine that the code is running on.

@param filename  the filename to query, null returns null
@return the name of the file without the path, or an empty string if none exists