Implemented basic "cat" functionality

Added newline to rbecho.rs
Shortened TryFrom<Result<DirEntry, io::Error>> for FileInfo

src/bin/rbcat.rs

@@ -0,0 +1,27 @@
+use std::{env, fs};
+use std::io::{self, BufRead};
+
+fn main() -> Result<(), io::Error> {
+    if env::args().len() < 2 {
+        let mut stdin = io::stdin().lock();
+        loop {
+            let mut line = String::new();
+            stdin.read_line(&mut line)?;
+            print!("{}", line);
+        }
+    }
+    for file_name in env::args().skip(1) {
+        match fs::read_to_string(&file_name) {
+            Ok(contents) => print!("{}", contents),
+            Err(error) => {
+                let msg = match error.kind() {
+                    io::ErrorKind::PermissionDenied => "Permission denied",
+                    io::ErrorKind::NotFound => "No such file or directory",
+                    _ => "Unexpected I/O error"
+                };
+                eprintln!("rbcat: {}: {}", file_name, msg);
+            }
+        }
+    }
+    return Ok(());
+}

src/bin/rbls.rs

@@ -80,11 +80,7 @@ impl TryFrom<DirEntry> for FileInfo {
 impl TryFrom<Result<DirEntry, io::Error>> for FileInfo {
     type Error = io::Error;
 
-    fn try_from(de: Result<DirEntry, io::Error>) -> Result<Self, Self::Error> {
-        let de = de?;
-        let name = de.file_name().into_string().unwrap();
-        Ok(Self { name, metadata: de.metadata()? })
-    }
+    fn try_from(de: Result<DirEntry, io::Error>) -> Result<Self, Self::Error> { Self::try_from(de?) }
 }
 
 #[derive(Parser)]