Rust 文字列をベクタ(可変の配列)に変換する

"文字列".char_indices().collect::<Vec<_>>();

fn main() {

    let mut str: String = "mebee".to_string();

    println!( "{:?}", str.char_indices().collect::<Vec<_>>() );

    str = "あいうえお".to_string();
    // [(0, 'm'), (1, 'e'), (2, 'b'), (3, 'e'), (4, 'e')]

    println!( "{:?}", str.char_indices().collect::<Vec<_>>() );
    // [(0, 'あ'), (3, 'い'), (6, 'う'), (9, 'え'), (12, 'お')]

    str = "     ".to_string();

    println!( "{:?}", str.char_indices().collect::<Vec<_>>() );
    // [(0, ' '), (1, ' '), (2, ' '), (3, ' '), (4, ' ')]

}

fn main() {

    let str: String = "😵😶😷".to_string();

    println!( "{:?}", str.char_indices().collect::<Vec<_>>() );

}