chore: drop allow(unused) and clear what it hid

src/command_builder.rs

@@ -1,12 +1,7 @@
-use anyhow::{anyhow, Context, Result};
+use anyhow::{Context, Result};
 use std::{
-    collections::VecDeque,
     env,
-    ffi::OsStr,
     fmt::Display,
-    fs::{File, OpenOptions},
-    os::unix::process::CommandExt,
-    path::PathBuf,
     process::{Child, Command, Stdio},
 };
 
@@ -77,20 +72,20 @@ impl CommandBuilder {
         Ok(command)
     }
 
-    pub fn exec_get_stdout(mut self) -> Result<String> {
+    pub fn exec_get_stdout(self) -> Result<String> {
         Ok(String::from_utf8(self.build()?.output()?.stdout)?)
     }
 
-    pub fn exec(mut self) -> Result<()> {
+    pub fn exec(self) -> Result<()> {
         self.build()?.spawn()?.wait()?;
         Ok(())
     }
 
-    pub fn spawn(mut self) -> Result<(Child)> {
+    pub fn spawn(self) -> Result<Child > {
         Ok(self.build()?.spawn()?)
     }
 
-    pub fn exec_redirect_stdout(mut self, stdio: Stdio) -> Result<()> {
+    pub fn exec_redirect_stdout(self, stdio: Stdio) -> Result<()> {
         self.build()?.stdout(stdio).spawn()?.wait()?;
         Ok(())
     }