refactoring, cleanup

Cargo.lock

@@ -67,6 +67,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.99"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0674a1ddeecb70197781e945de4b3b8ffb61fa939a5597bcf48503737663100"
+
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -244,6 +250,7 @@ dependencies = [
 name = "ldr"
 version = "1.0.2"
 dependencies = [
+ "anyhow",
  "chrono",
  "clap",
  "tempfile",