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pub fn read_file(path : &str) -> Result<Vec<String>, io::Error> {
    let contents = fs::read_to_string(path)
        .expect("Something went wrong reading the file");
    println!("{}", contents);
    Ok(contents.split('\n').map(|s| s.to_string()).collect())
}
 
pub fn last_n_lines(vec : &Vec<String>, line : usize) -> Vec<String> {
    vec.iter().enumerate().filter(|&(i, _)| i >= line).map(|(_, e)| e.to_string()).collect()
}
 
pub fn join(vec : &Vec<String>, delim : &String) -> String {
    vec.join(delim)
}
 
 
// THIS FUNCTION CALLS THE REST
pub fn read_markdown_file(path : &str) -> Result<Markdown, io::Error> {
    let vdocument = read_file(path)?;
    let front_matter_end = match vdocument.iter().rposition(|x| x == "---") {
        Some(x) => x+1,
        None => 0,
    };
    let markdown = join(&last_n_lines(&vdocument, front_matter_end), &String::from("\n"));
 
}

error[E0433]: failed to resolve: use of undeclared type or module `io`
 --> prog.rs:1:54
  |
1 | pub fn read_file(path : &str) -> Result<Vec<String>, io::Error> {
  |                                                      ^^ use of undeclared type or module `io`

error[E0433]: failed to resolve: use of undeclared type or module `fs`
 --> prog.rs:2:20
  |
2 |     let contents = fs::read_to_string(path)
  |                    ^^ use of undeclared type or module `fs`

error[E0433]: failed to resolve: use of undeclared type or module `io`
  --> prog.rs:18:60
   |
18 | pub fn read_markdown_file(path : &str) -> Result<Markdown, io::Error> {
   |                                                            ^^ use of undeclared type or module `io`

error[E0412]: cannot find type `Markdown` in this scope
  --> prog.rs:18:50
   |
18 | pub fn read_markdown_file(path : &str) -> Result<Markdown, io::Error> {
   |                                                  ^^^^^^^^ not found in this scope

error[E0601]: `main` function not found in crate `prog`
  |
  = note: consider adding a `main` function to `prog.rs`

error: aborting due to 5 previous errors

Some errors occurred: E0412, E0433, E0601.
For more information about an error, try `rustc --explain E0412`.

Standard output is empty