usestd::fs::File;usestd::io::{Read,Result};usestd::path::Path;/// Return the string contents of a file
pubfnread_file<P:AsRef<Path>>(file_name: P)->Result<String>{letmut file =File::open(file_name)?;letmut data =String::new();
file.read_to_string(&mut data)?;Ok(data)}