Break out copying to target path

src/main.rs

···
+use std::path::{Path, PathBuf};
+
 use clap::Parser;
 use glob::glob;
 use miette::IntoDiagnostic;
···
                 let guess = mime_guess::from_path(&path);
                 match guess.first() {
                     Some(mime) if mime.type_() == mime::IMAGE => {
-                        let metadata = std::fs::metadata(&path).into_diagnostic()?;
-                        let created: chrono::DateTime<chrono::Local> =
-                            metadata.created().into_diagnostic()?.into();
-                        let dest_path = cli.target_dir.join(created.date_naive().to_string());
+                        let dest_path = copy_file_to_target(&path, &cli.target_dir)?;
 
-                        if !dest_path.exists() {
-                            std::fs::create_dir_all(&dest_path).into_diagnostic()?;
-                        }
-
-                        let dest_path = dest_path.join(path.file_name().unwrap());
                         println!("{} - {} ({:?})", path.display(), dest_path.display(), guess);
-                        std::fs::copy(&path, dest_path).into_diagnostic()?;
                     }
                     _ => {}
                 }
···
 
     Ok(())
 }
+
+pub fn copy_file_to_target(origin_path: &Path, target_path: &Path) -> miette::Result<PathBuf> {
+    let metadata = std::fs::metadata(origin_path).into_diagnostic()?;
+    let created: chrono::DateTime<chrono::Local> = metadata.created().into_diagnostic()?.into();
+    let dest_path = target_path.join(created.date_naive().to_string());
+
+    if !dest_path.exists() {
+        std::fs::create_dir_all(&dest_path).into_diagnostic()?;
+    }
+
+    let dest_path = dest_path.join(origin_path.file_name().unwrap());
+
+    std::fs::copy(origin_path, &dest_path).into_diagnostic()?;
+
+    Ok(dest_path)
+}