fix: remove Clone derive and fix context method usage

src/digest_engine.rs

@@ -1,4 +1,4 @@
-use anyhow::{anyhow, Context, Result};
+use anyhow::{anyhow, Result};
 use std::io;
 
 use lazy_static::lazy_static;

src/digest_engine/program.rs

@@ -10,12 +10,11 @@ use std::process::{Command, Stdio};
 
 use crate::digest_engine::DigestEngine;
 
-#[derive(Debug, Clone)]
+#[derive(Debug)]
 pub struct DigestEngineProgram {
     pub program: String,
     pub args: Vec<String>,
     pub supported: bool,
-    process: Option<std::process::Child>,
 }
 
 impl DigestEngineProgram {
@@ -53,7 +52,7 @@ impl DigestEngine for DigestEngineProgram {
             .stdin(Stdio::piped())
             .stdout(Stdio::piped())
             .spawn()
-            .with_context(anyhow!(
+            .context(anyhow!(
                 "Problem spawning child process: {:?} {:?}",
                 program,
                 args