Maximum Number of Balloons LeetCode solution in Rust

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impl Solution {
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  pub fn max_number_of_balloons(text: String) -> i32 {
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    use std::collections::HashMap;
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    let mut counter: HashMap<char, i32> = "balloon".chars().map(|c| (c, 0)).collect();
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    text.chars().for_each(|c| {
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      counter.entry(c).and_modify(|e| *e += 1);
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    });
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    counter
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      .iter()
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      .map(|(&c, &num)| num / if "lo".contains(c) { 2 } else { 1 })
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      .min()
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      .unwrap()
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  }
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}