You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: writer.rs
    path of file: ./repos/cargo-snippet/src
    
    the code of the file until where you have to start completion: use serde_derive::Serialize;
use std::collections::BTreeMap;

#[derive(Serialize)]
struct VScode {
    prefix: String,
    body: Vec<String>,
}

#[cfg(feature = "inner_rustfmt")]
pub fn format_src(src: &str) -> Option<String> {
    let mut rustfmt_config = rustfmt_nightly::Config::default();
    rustfmt_
    
pub fn write_neosnippet(snippets: &BTreeMap<String, String>) {
    for (name, content) in snippets.iter() {
        if let Some(formatted) = format_src(content) {
            println!("snippet {}", name);
            for line in formatted.lines() {
                println!("    {}", line);
            }
            println!();
        }
    }
}