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: file_readers.rs
    path of file: ./repos/tidy/src
    
    the code of the file until where you have to start completion: use crate::split_and_vectorize;
use std::fs::File;
use std::io::BufRead;
use std::io::BufReader;
use std::path::PathBuf;

/// Takes a slice of `PathBuf`s representing the word list(s)
/// that the user 
    
pub fn blend(word_lists_by_file: &[Vec<String>]) -> Vec<String> {
    let mut size_of_longest_vector = 0;
    for word_list in word_lists_by_file {
        if size_of_longest_vector < word_list.len() {
            size_of_longest_vector = word_list.len();
        }
    }
    // "Blend" words together one at a time, like dealing cards in reverse
    let mut blended = [].to_vec();
    for i in 0..size_of_longest_vector {
        for list in word_lists_by_file {
            if list.len() > i {
                // Dunno how to not call clone here...
                blended.push(list[i].clone());
            }
        }
    }
    blended
}