如何创建迭代器来生成由Rust中的索引列表指定的集合的元素？

struct IndexListIterator<T> {
    collection: Vec<T>,
    indices: Vec<usize>,
    current_index: usize,
}

impl<T> IndexListIterator<T> {
    fn new(collection: Vec<T>, indices: Vec<usize>) -> Self {
        IndexListIterator {
            collection,
            indices,
            current_index: 0,
        }
    }
}

impl<T> Iterator for IndexListIterator<T> {
    type Item = T;

    fn next(&mut self) -> Option<Self::Item> {
        if self.current_index < self.indices.len() {
            let index = self.indices[self.current_index];
            self.current_index += 1;
            Some(self.collection[index].clone())
        } else {
            None
        }
    }
}

fn main() {
    let collection = vec!['a', 'b', 'c', 'd', 'e'];
    let indices = vec![1, 3, 4];

    let iterator = IndexListIterator::new(collection, indices);

    for item in iterator {
        println!("{}", item);
    }
}