Remove display prefix from unexpected errors, was causing redundancy in nested errors

src/error/unexpected.rs

@@ -52,7 +52,7 @@ impl Error {
 
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Unexpected error occurred: {}", self.0)
+        write!(f, "{}", self.0)
     }
 }