diff --git a/src/lib.rs b/src/lib.rs
index baae4da..d0313e2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,26 +19,46 @@ pub struct CmdOutput {
 impl CmdOutput {
     /// Returns only stdout
     pub fn stdout(self) -> Option<Vec<Line>> {
-        self.lines.and_then(|lines| {
-            Some(
-                lines
-                    .into_iter()
-                    .filter(|line| line.printed_to == LineType::Stdout)
-                    .collect(),
-            )
-        })
+        match self.lines {
+            Some(lines) => {
+                return Some(
+                    lines
+                        .into_iter()
+                        .filter(|l| {
+                            if l.printed_to == LineType::Stdout {
+                                return true;
+                            }
+                            return false;
+                        })
+                        .collect(),
+                );
+            }
+            None => {
+                return None;
+            }
+        }
     }
 
     /// Returns only stdout
     pub fn stderr(self) -> Option<Vec<Line>> {
-        self.lines.and_then(|lines| {
-            Some(
-                lines
-                    .into_iter()
-                    .filter(|line| line.printed_to == LineType::Stderr)
-                    .collect(),
-            )
-        })
+        match self.lines {
+            Some(lines) => {
+                return Some(
+                    lines
+                        .into_iter()
+                        .filter(|l| {
+                            if l.printed_to == LineType::Stderr {
+                                return true;
+                            }
+                            return false;
+                        })
+                        .collect(),
+                );
+            }
+            None => {
+                return None;
+            }
+        }
     }
 
     /// Returns all output
@@ -195,7 +215,7 @@ pub fn run(command: &mut Command) -> CmdOutput {
     };
 }
 
-pub fn run_funcs(
+pub fn run_with_funcs(
     command: &mut Command,
     stdout_func: impl Fn(Lines<BufReader<ChildStdout>>) -> () + std::marker::Send + 'static,
     stderr_func: impl Fn(Lines<BufReader<ChildStderr>>) -> () + std::marker::Send + 'static,
@@ -231,42 +251,3 @@ pub fn run_funcs(
         duration: end.duration_since(start),
     };
 }
-
-pub fn run_funcs_with_lines(
-    command: &mut Command,
-    stdout_func: impl Fn(Lines<BufReader<ChildStdout>>) -> Vec<Line> + std::marker::Send + 'static,
-    stderr_func: impl Fn(Lines<BufReader<ChildStderr>>) -> Vec<Line> + std::marker::Send + 'static,
-) -> CmdOutput {
-    // https://stackoverflow.com/a/72831067/16432246
-    let start = Instant::now();
-    let mut child = command
-        .stdout(Stdio::piped())
-        .stderr(Stdio::piped())
-        .spawn()
-        .unwrap();
-
-    let child_stdout = child.stdout.take().unwrap();
-    let child_stderr = child.stderr.take().unwrap();
-
-    let stdout_lines = BufReader::new(child_stdout).lines();
-    let stderr_lines = BufReader::new(child_stderr).lines();
-
-    let stdout_thread = thread::spawn(move || stdout_func(stdout_lines));
-    let stderr_thread = thread::spawn(move || stderr_func(stderr_lines));
-
-    let mut lines = stdout_thread.join().unwrap();
-    let mut lines_printed_to_stderr = stderr_thread.join().unwrap();
-    lines.append(&mut lines_printed_to_stderr);
-    lines.sort();
-
-    let status = child.wait().unwrap().code();
-    let end = Instant::now();
-
-    return CmdOutput {
-        lines: Some(lines),
-        status_code: status,
-        start_time: start,
-        end_time: end,
-        duration: end.duration_since(start),
-    };
-}
diff --git a/src/tests.rs b/src/tests.rs
index 30f87d4..d91aa69 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -88,19 +88,19 @@ fn shuffle_vec<T>(vec: &mut [T]) {
 }
 
 #[test]
-fn test_run_funcs() {
+fn test_run_with_funcs() {
     let _ = thread::spawn(|| {
-        let _ = run_funcs(
+        let _ = run_with_funcs(
             Command::new("bash")
                 .arg("-c")
-                .arg("echo hi; >&2 echo hello"),
+                .arg("echo hi; sleep 0.5; >&2 echo hello"),
             {
                 |stdout_lines| {
                     sleep(Duration::from_secs(1));
                     for _ in stdout_lines {
                         Command::new("bash")
                             .arg("-c")
-                            .arg("echo stdout >> ./tmp-run_runcs")
+                            .arg("echo stdout >> ./tmp")
                             .output()
                             .unwrap();
                     }
@@ -112,7 +112,7 @@ fn test_run_funcs() {
                     for _ in stderr_lines {
                         Command::new("bash")
                             .arg("-c")
-                            .arg("echo stderr >> ./tmp-run_runcs")
+                            .arg("echo stderr >> ./tmp")
                             .output()
                             .unwrap();
                     }
@@ -121,7 +121,7 @@ fn test_run_funcs() {
         );
     });
     sleep(Duration::from_secs(2));
-    let f = File::open("./tmp-run_runcs").unwrap();
+    let f = File::open("./tmp").unwrap();
     let mut buf: [u8; 14] = [0u8; 14];
     f.read_at(&mut buf, 0).unwrap();
     assert_eq!(buf, [115, 116, 100, 111, 117, 116, 10, 0, 0, 0, 0, 0, 0, 0]);
@@ -133,58 +133,5 @@ fn test_run_funcs() {
         [115, 116, 100, 111, 117, 116, 10, 115, 116, 100, 101, 114, 114, 10]
     );
 
-    remove_file("./tmp-run_runcs").unwrap();
-}
-
-#[test]
-fn test_run_funcs_with_lines() {
-    let _ = thread::spawn(|| {
-        let _ = run_funcs_with_lines(
-            Command::new("bash")
-                .arg("-c")
-                .arg("echo hi; >&2 echo hello"),
-            {
-                |stdout_lines| {
-                    sleep(Duration::from_secs(1));
-                    for line in stdout_lines {
-                        assert_eq!(line.unwrap(), "hi");
-                        Command::new("bash")
-                            .arg("-c")
-                            .arg("echo stdout >> ./tmp-run_runcs_with_lines")
-                            .output()
-                            .unwrap();
-                    }
-                    return Vec::new();
-                }
-            },
-            {
-                |stderr_lines| {
-                    sleep(Duration::from_secs(3));
-                    for line in stderr_lines {
-                        assert_eq!(line.unwrap(), "hello");
-                        Command::new("bash")
-                            .arg("-c")
-                            .arg("echo stderr >> ./tmp-run_runcs_with_lines")
-                            .output()
-                            .unwrap();
-                    }
-                    return Vec::new();
-                }
-            },
-        );
-    });
-    sleep(Duration::from_secs(2));
-    let f = File::open("./tmp-run_runcs_with_lines").unwrap();
-    let mut buf: [u8; 14] = [0u8; 14];
-    f.read_at(&mut buf, 0).unwrap();
-    assert_eq!(buf, [115, 116, 100, 111, 117, 116, 10, 0, 0, 0, 0, 0, 0, 0]);
-
-    sleep(Duration::from_secs(2));
-    f.read_at(&mut buf, 0).unwrap();
-    assert_eq!(
-        buf,
-        [115, 116, 100, 111, 117, 116, 10, 115, 116, 100, 101, 114, 114, 10]
-    );
-
-    remove_file("./tmp-run_runcs_with_lines").unwrap();
+    remove_file("./tmp").unwrap();
 }