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impl Solution {
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  pub fn uncommon_from_sentences(s1: String, s2: String) -> Vec<String> {
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    let mut map = std::collections::HashMap::new();
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    s1.split(' ')
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      .chain(s2.split(' '))
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      .for_each(|s| *map.entry(s).or_insert(0) += 1);
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    map
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      .iter()
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      .filter_map(|(key, val)| match *val == 1 {
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        true => Some((*key).to_string()),
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        false => None,
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      })
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      .collect::<Vec<_>>()
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  }
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}