use std::{fs, io};
use std::path::Path;

pub fn list_of_files_in_directory(root_directory: &Path) -> String {

     let mut return_value = String::new();

     if root_directory.is_dir() {
          for entry in fs::read_dir(root_directory).unwrap() {
               let entry = entry.unwrap();
               let path = entry.path();
               if path.is_file() {
                    return_value = format!("{}\n{}", return_value, path.file_name().unwrap().to_string_lossy());
               }
          }
     }
     return_value
}