You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: trie.go
    path of file: ./repos/go-starter-kit/vendor/golang.org/x/text/collate/build
    
    the code of the file until where you have to start completion: // Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// The trie in this file is used to associate the first full character
// in a UTF-8 string to a collation element.
// All but the last byte in a UTF-8 byte sequence are
// used to look up offsets in the index table to be
    
func newTrieBuilder() *trieBuilder {
	index := &trieBuilder{}
	index.lookupBlocks = make([]*trieNode, 0)
	index.valueBlocks = make([]*trieNode, 0)
	index.lookupBlockIdx = make(map[uint32]*trieNode)
	index.valueBlockIdx = make(map[uint32]*trieNode)
	// The third nil is the default null block.  The other two blocks
	// are used to guarantee an offset of at least 3 for each block.
	index.lookupBlocks = append(index.lookupBlocks, nil, nil, nil)
	index.t = &trie{}
	return index
}