Feat: return error in unwrap.

src/main.rs

@@ -7,7 +7,7 @@ struct Cli {
     path: std::path::PathBuf,
 }
 
-fn main() {
+fn main() -> Result<(), Box<dyn std::error::Error>>{
     let args = Cli::parse();
 
     // let content = std::fs::read_to_string(&args.path).expect("Could not read file.");
@@ -18,16 +18,15 @@ fn main() {
             content
         },
         Err(error) => {
-            panic!("Oh no error: {}", error);
+            return Err(error.into());
         }
     };
 
-    // can do the same with following
-    // let content = std::fs::read_to_string(&args.path).unwrap();
-
     for line in content.lines() {
         if line.contains(&args.pattern) {
             println!("{}", line)
         }
     }
+
+    Ok(())
 }