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feat(simple_hash): rewrite exercise completely
improve the way students are introduced to hash maps
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@ -6,14 +6,14 @@ Create a **function** named `word_frequency_counter` which will receive a vector
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Also create a function named `nb_distinct_words` which will take a reference to the `HashMap` and return the number of distinct words present in it.
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> all the words tested will be lowercase
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### Expected functions
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```rust
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pub fn word_frequency_counter(words: Vec<&str>) -> HashMap<&str, usize> {}
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pub fn nb_distinct_words(frequency_count: &HashMap<&str, usize>) -> usize {
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}
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pub fn nb_distinct_words(frequency_count: &HashMap<&str, usize>) -> usize {}
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```
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### Usage
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