Make The String Great LeetCode solution in Rust

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impl Solution {
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  pub fn make_good(s: String) -> String {
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    s.chars()
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      .fold(String::new(), |mut rez, c2| match (rez.pop(), c2) {
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        (None, c2) => c2.to_string(),
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        (Some(c1), c2) if c1 != c2 && c1.to_lowercase().eq(c2.to_lowercase()) => rez,
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        (Some(c1), c2) => rez + &c1.to_string() + &c2.to_string(),
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      })
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  }
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}