code: public static String appendPath(String... phs) {
          String[] paths = Lang.without(phs, null);
          if (null != paths && paths.length > 0) {
              // zozoh: 嗯下面的逻辑木有必要了吧
              // if (null == paths[0])
              // paths[0] = "/";
              String str = Lang.concat("/", paths).toString();
              String[] ss = Strings.splitIgnoreBlank(str, "/");
              str = Lang.concat("/", ss).toString();
              if (paths[0].startsWith("/")) {
                  return "/" + str;
              }
              return str;
          }
          return null;
      }
docs: 将多个路径拼合成一个路径，他会自动去除重复的 "/"
  
  <pre>
  appendPath("a","b")  => "a/b"
  appendPath("/a","b/c")  => "/a/b/c"
  appendPath("/a/","/b/c")  => "/a/b/c"
  </pre>
  
  @param phs
  路径数组
  @return 拼合后的路径