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Radix tree in Go

Quick experiment to speed up searchs form my http router.

http://en.wikipedia.org/wiki/Radix_tree

Patricia trie

Example:

	n := radix.New()
	n.Insert("romane", "romane")
	n.Insert("romanus", "romanus")
	n.Insert("romulus", "romulus")
	n.Insert("rubens", "rubens")
	n.Insert("ruber", "ruber")
	n.Insert("rubicon", "rubicon")
	n.Insert("rubicundus", "rubicundus")

Builds:

r <nil>
-om <nil>
--an <nil>
---e romane
---us romanus
--ulus romulus
-ub <nil>
--e <nil>
---ns rubens
---r ruber
--ic <nil>
---on rubicon
---undus rubicundus

Search a path:

	v, ok := n.Lookup("rubicundus")
	if !ok {
		t.Fatal("path not found")
	}

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