Adding Spaces to a String LeetCode solution in Rust

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impl Solution {
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  pub fn add_spaces(s: String, spaces: Vec<i32>) -> String {
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    let s = s.chars().into_iter().collect::<Vec<char>>();
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    let n = s.len();
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    let mut result = vec!['a'; n + spaces.len()];
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    for i in 0..spaces.len() {
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      result[spaces[i] as usize + i] = ' ';
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    }
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    let mut i = 0;
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    for ci in 0..result.len() {
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      if result[ci] != ' ' {
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        result[ci] = s[i];
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        i += 1;
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      }
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    }
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    result
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      .into_iter()
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      .map(|v| v.to_string())
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      .collect::<String>()
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  }
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}