// mod settings {
//     pub fn max_col() -> u16 { 11 }
// }

fn main() {
    // let long_str = "hello world\
    //                 Lorem ipsum\
    //                 dolor sit a\
    //                 met, consec\
    //                 tetur adipi\
    //                 scing elit,\
    //                 sed do eius\
    //                 mod tempor \
    //                 incididunt \
    //                 ut\
    //               ";
    // let mut v1: Vec<char> = long_str.chars().collect();

    // v1.push('\n');
    // v1.push('半');

    // // let v2 = b"hello, world".to_vec();
    // // let v3 = b"hello, world!".to_vec();

    // println!("v1 len: {}", v1.len());
    // println!("v1 index[10] \"{}\"", v1[10]);

    // fn idx(row: u16, col: u16) -> usize {
    //     ((row * settings::max_col()) + col) as usize
    // }

    // // eg. goto(1, 3)
    // // let coords = (3, 5);
    // let mut end_row = (v1.len() - 1) / settings::max_col() as usize;
    // let mut end_col = (v1.len() - 1) % settings::max_col() as usize;
    // println!("ending y: {}, ending x: {}", end_row, end_col);
    // println!("goto char @ (0,5) : \"{}\"", v1[idx(0, 5)]);

    // v1.insert(idx(0, 5), ',');

    // println!("goto char @ (0,5): \"{}\"", v1[idx(0, 5)]);

    // end_row = (v1.len() - 1) / settings::max_col() as usize;
    // end_col = (v1.len() - 1) % settings::max_col() as usize;
    // println!("ending y: {}, ending x: {}", end_row, end_col);

    // println!("goto char @ end: \"{}\"",
    //     v1[idx(end_row as u16, end_col as u16)]);

    // println!("char length: {}", '全'.len_utf8());
    // println!("char length: {}", '角'.len_utf8());
    // println!("char length: {}", '半'.len_utf8());

    // // let fix_array = ['半'; 264144];
    // // println!("array memsize: {}", std::mem::size_of::<[u32; 262144]>());
    // // 1056576

    let characters: Vec<u8> = "ho半".bytes().collect();
    println!("vec<u8>: {:?}", characters);

    let str_chars = std::str::from_utf8(&characters);
    println!("str: {}", str_chars.unwrap());

    // let mut vec_chars = str_chars.unwrap().chars();
    // while let Some(c) = vec_chars.next() {
    //     println!("char: {}", c);
    // }
}