Apply Discount to Prices LeetCode solution in Rust

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use std::fmt::Write as FmtWrite;
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impl Solution {
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  pub fn discount_prices(sentence: String, discount: i32) -> String {
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    let mut new_str = String::new();
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    for (i, word) in sentence.split_whitespace().enumerate() {
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      if i != 0 {
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        new_str.push(' ');
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      }
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      if word.len() > 0 {
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        if word.as_bytes()[0] == b'$' {
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          if (&word[1..]).chars().all(|c| c >= '0' && c <= '9') {
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            if let Ok(num) = &word[1..].parse::<f64>() {
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              let n = num * ((100 - discount) as f64 / 100_f64);
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              write!(&mut new_str, "${:.2}", n);
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              continue;
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            }
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          }
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        }
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      }
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      new_str.push_str(word);
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    }
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    new_str
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  }
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}