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Carefully analyze the C code in "./src" of the "TriesWithFrequencies" data structure and functions and create :
- Corresponding Raku native implementation in the file "./lib/ML/TriesWithFrequencies/Native.rakumod"
- Tests in the directory "t"
- Suitable example script in the directory "examples"
Note that: 
- This Raku package, "ML::TriesWithFrequencies::Native", has its functions / subs with the prefix "native-trie-".
- The Raku package "ML::TriesWithFrequencies" has its functions / subs with the prefix "trie-".

For visualization purposes the native tries are converted to "ML::TriesWithFrequencies" tries using the code like:
`trie-from-map-format(native-trie-to-map-format($nativeTrie))` .

So, implement, in Raku, the sub `native-trie-to-map` that converts the native Trie structure to a Raku hashmap. 

Ok. Add / implement the sub `native-trie-count`s. 
That uses `sub c-node-counts(NativeTrieNode, size_t, size_t, size_t) is native($library) is symbol('twf_node_counts') { * }` or similar.

Implement native-trie-random-choice -- it looks like you missed it.

Something is wrong. If I use he command `my @randomWords = native-trie-random-choice($ptr, 20);`  
I get \`[((Str) (Str) (Str) (Str)) ((Str) (Str) (Str) (Str)) ...\`

Re-implement `native-trie-create` to use the C `twf_create`. 
So, `word-array` is called on all words and then they are handed to `twf_create`.