### Question:
RadixTree { public void removePrefixPath(String path) { Path p = Paths.get(path); removePrefixPathInternal(root, p, 0); } RadixTree(); boolean isEmpty(); void insert(String path); void insert(String path, T val); RadixNode<T> getLastNodeInPrefixPath(String path); void removePrefixPath(String path); List<RadixNode<T>> getLongestPrefixPath(String path); @VisibleForTesting /** * Convert radix path to string format for output. * @param path - radix path represented by list of radix nodes. * @return radix path as string separated by "/". * Note: the path will always be normalized with and ending "/". */ static String radixPathToString(List<RadixNode<Integer>> path); String getLongestPrefix(String path);  }### Answer:
@Test public void testRemovePrefixPath() { ROOT.removePrefixPath("/a/b/c/d/g/h"); assertEquals("/a/b/c", ROOT.getLongestPrefix("a/b/c/d")); ROOT.insert("/a/b/c/d/g/h"); ROOT.removePrefixPath("/a/b/c/d"); assertEquals("/a/b/c/d", ROOT.getLongestPrefix("a/b/c/d")); ROOT.insert("/a/b/c/d"); ROOT.removePrefixPath("/d/a"); assertEquals("/a/b/c/d", ROOT.getLongestPrefix("a/b/c/d")); }