improved error handling

src/error.rs

@@ -1,14 +1,10 @@
-use std::io;
 use thiserror::Error;
 
 /// Custom error types for the mould application.
 #[derive(Error, Debug)]
 pub enum MouldError {
     #[error("IO error: {0}")]
-    Io(#[from] io::Error),
-
-    #[error("Format error: {0}")]
-    Format(String),
+    Io(#[from] std::io::Error),
 
     #[error("File not found: {0}")]
     FileNotFound(String),