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: screen.rs
    path of file: ./repos/void/src
    
    the code of the file until where you have to start completion: use std::{
    self,
    cmp::{max, min},
    collections::{BTreeMap, BinaryHeap, HashMap, HashSet},
    env,
    fmt::Write as FmtWrite,
    fs::{remove_file, rename, File, OpenOptions},
    io::{self, stdin, stdout, Error, ErrorKind, Read, Seek, SeekFrom, Stdout, Write},
    process,
};

use termion::{
    clear, color, cursor,
    event::{Event, Key},
    input::{MouseTerminal, TermRead},
    raw::{IntoRawMode, RawTerminal},
    screen::AlternateScreen,
    style, terminal_s
    
    fn create_free_node(&mut self) {
        let min_width = self.dims.0 / 3;
        let mut y_cursor = self.view_y + 2;
        let mut from_x = None;
        'outer: loop {
            trace!("in create_free_node loop");
            // go down until we find a spot
            // that's wide enough, then create
            // an anchor there.
            let mut width = 0;
            if self.dims.0 < 2 {
                from_x = Some(1);
                break;
            }
            for x in 1..self.dims.0 {
                if self.lookup((x, y_cursor)).is_none() {
                    width += 1;
                    if from_x.is_none() {
                        from_x = Some(x)
                    }
                    if width >= min_width {
                        break 'outer;
                    }
                } else {
                    from_x = None;
                    width = 0;
                }
            }
            y_cursor += 1;
        }
        self.create_anchor((from_x.unwrap(), y_cursor));
    }