trie := &trieSlice{
    Children: make([]*tNode, 5),
}

trie.Children[0] = &tNode{Children: make([]*tNode, 5), IsLeaf: true, Value: 10}
trie.Children[4] = &tNode{Children: make([]*tNode, 5), IsLeaf: true, Value: 20}


// YAML marshal
yamlB, err := yaml.Marshal(trie)
if err != nil {
    fmt.Println("error in yaml conversion ...", err.Error())
}
ioutil.WriteFile("../resources/trieSliceBorder.yml", yamlB, 0644)

// JSON marshal
b, err := json.Marshal(trie)
if err != nil {
    fmt.Println("error while marshalling final trie json ", err.Error())
    t.Fail()
}
ioutil.WriteFile("../resources/trieSliceBorder.json", b, 0644)

{
    "c": [null, null, null, null, {
        "c": [null, null, null, null, null, null, null,
            {
                "c": [null, null, null, null, null, null, null],
                "v": 1,
                "e": true
            }
        ]
    }]
}```