normalize_path(path) private

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# File lib/webrick/httputils.rb, line 21
    def normalize_path(path)
      raise "abnormal path `#{path}'" if path[0] != //
      ret = path.dup

      ret.gsub!(%{/+}, '/')                    # //      => /
      while ret.sub!(%/\.(?:/|\Z)', '/'); end  # /.      => /
      while ret.sub!(%/(?!\.\./)[^/]+/\.\.(?:/|\Z)', '/'); end # /foo/.. => /foo

      raise "abnormal path `#{path}'" if %{/\.\.(/|\Z)} =~ ret
      ret
    end
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