diff --git a/examples/multipos.rs b/examples/multipos.rs
index b76bf8e..953829d 100644
--- a/examples/multipos.rs
+++ b/examples/multipos.rs
@@ -40,7 +40,7 @@ fn main() {
         0 => println!("Debug mode is off"),
         1 => println!("Debug mode is kind of on"),
         2 => println!("Debug mode is on"),
-        3 | 4 | 5 => println!("too much dude !"),
+        3 ..= 5 => println!("too much dude !"),
         _ => println!("Don't be crazy"),
     }
 
diff --git a/src/parse.rs b/src/parse.rs
index fbe5569..92c072e 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -1,4 +1,3 @@
-
 use super::{Columns, Column};
 use anyhow::{anyhow, Result};
 use regex::Regex;
@@ -23,7 +22,7 @@ impl<'a> InputText<'a> {
 
     pub fn new(raw: &'a str, sep: &str) -> Self {
        InputText {
-           raw: raw.into(),
+           raw,
            sep: sep.into()
        } 
     }
@@ -45,6 +44,10 @@ impl<'a> InputText<'a> {
     pub fn len(self) -> usize {
         self.raw.len()
     }
+
+    pub fn is_empty(self) -> bool {
+        self.raw.is_empty()
+    }
 }
 
 /// Return the number of columns given input text and a separator
@@ -58,7 +61,7 @@ pub fn n_columns(text: &str, sep: &str) -> Result<usize> {
     // count number of columns
     match lines.first() {
         Some(line) => Ok(re.split(line).count()),
-        None => return Err(anyhow!("no lines left")),
+        None => Err(anyhow!("no lines left")),
     }
 }
 
@@ -98,7 +101,6 @@ pub fn split_columns(text: &str, sep: &str) -> Result<Columns> {
 mod tests {
     use super::*;
     use crate::DEFAULT_SEP_PATTERN;
-    use regex::Regex;
     use std::error::Error;
 
     type TestResult = Result<(), Box<dyn Error>>;
@@ -136,13 +138,13 @@ file with space\ttitle 4\textra
     }
 
     // #[test]
-    fn test_re_split() {
-        let text = "this is		two tabs";
-        let re = Regex::new(r"[\t]+").unwrap();
-        let fields: Vec<&str> = re.split(text).collect();
-        eprintln!("{:?}", fields);
-        assert!(false);
-    }
+    // fn test_re_split() {
+    //     let text = "this is		two tabs";
+    //     let re = Regex::new(r"[\t]+").unwrap();
+    //     let fields: Vec<&str> = re.split(text).collect();
+    //     eprintln!("{:?}", fields);
+    //     assert!(false);
+    // }
 
     #[test]
     fn test_columns_from_str() {
diff --git a/src/stdin.rs b/src/stdin.rs
index d7f0c1b..23eb08a 100644
--- a/src/stdin.rs
+++ b/src/stdin.rs
@@ -6,7 +6,7 @@ use std::io::{BufReader, self, Read};
 // TODO: make as iterator, avoid loading all stdin to memroy
 pub fn read_stdin() -> Result<Box<String>> {
     let mut r = BufReader::new(io::stdin());
-    let mut buf = Box::new(String::new());
+    let mut buf = Box::<String>::default();
     r.read_to_string(&mut buf)?;
     Ok(buf)
 }
diff --git a/tests/cli.rs b/tests/cli.rs
index 2843d28..c3ba37b 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -56,7 +56,7 @@ fn fail_yargs_mismatch1() -> TestResult {
     let mut cmd = Command::cargo_bin("yargs").unwrap();
 
     let assert = cmd
-        .args(&["one", "two"])
+        .args(["one", "two"])
         .pipe_stdin(input)?
         .assert();
     assert.failure();
@@ -67,8 +67,8 @@ fn fail_yargs_mismatch1() -> TestResult {
 #[test]
 fn cli_pass2()  {
     let mut cmd = Command::cargo_bin("yargs").unwrap();
-    cmd.args(&["-d", r"\s"])
-    .args(&["1", "2", "3", "4", "5", "6"]);
+    cmd.args(["-d", r"\s"])
+    .args(["1", "2", "3", "4", "5", "6"]);
     run_command("tests/inputs/input1", &mut cmd).unwrap()
         .success();
 }
@@ -79,8 +79,8 @@ fn cli_pass2()  {
 // delimiter: space
 fn cli_fail1() {
     let mut cmd = Command::cargo_bin("yargs").unwrap();
-    cmd.args(&["-d", r"\s"])
-    .args(&["1", "2", "3", "4", "5", "6", "7", "8"]);
+    cmd.args(["-d", r"\s"])
+    .args(["1", "2", "3", "4", "5", "6", "7", "8"]);
     run_command("tests/inputs/input1", &mut cmd).unwrap()
         .failure();
 }