如何在Rust中将字符串拆分成块以插入空格

fn split_string_into_blocks(input: &str, block_size: usize) -> String {
    let mut result = String::new();
    let mut index = 0;

    while index < input.len() {
        let end = index + block_size;
        let block = &input[index..end];

        result.push_str(block);
        result.push(' ');

        index += block_size;
    }

    result.trim_end().to_string()
}

fn main() {
    let input = "HelloWorld";
    let block_size = 2;
    let output = split_string_into_blocks(input, block_size);
    println!("{}", output); // Output: "He ll oW or ld"
}