diff --git a/Cargo.lock b/Cargo.lock
index 852b126..76d4169 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "adler"
diff --git a/flake.nix b/flake.nix
index 045c4e9..2f60c79 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,22 +3,18 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
   };
-  outputs =
-    {
-      self,
-      nixpkgs,
-    }@inputs:
+  outputs = { self, nixpkgs }@inputs:
     let
       supportedSystems = [ "x86_64-linux" ];
       forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-      # I improved how you call in packages
-      pkgs = forAllSystems (
-        system:
+      #v I improved how you call in packages
+      pkgs = forAllSystems (system:
         import nixpkgs {
           inherit system;
           #v this can be adjusted to read args passed without impure later
-          config = {
-            allowUnfree = true;
+          config = { allowUnfreePredicate = pkg: builtins.elem (nixpkgs.lib.getName pkg) [
+             "unrar"
+           ];
           };
         }
       );
@@ -31,8 +27,8 @@
         default = pkgs.${system}.callPackage ./nix/devshell.nix { };
       });
       nixConfig = {
-        # I would have like this to work but it requires the nix user to set an option.
+        #v I would have like this to work but it requires the nix user to set an option.
         allowUnfree = true;
       };
     };
-}
+}
\ No newline at end of file
diff --git a/nix/default.nix b/nix/default.nix
index 2cc0815..72061d5 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -1,23 +1,11 @@
-{
-  unrar,
-  xz,
-  pkg-config,
-  rustPlatform,
-  lib,
-}:
+{ pkgs ? import <nixpkgs> { }, lib }:
 
-rustPlatform.buildRustPackage {
+pkgs.rustPlatform.buildRustPackage rec {
   pname = "sk_extract";
   version = "0.1.0";
   cargoLock.lockFile = ../Cargo.lock;
-  src = lib.cleanSource ../.;
-  buildInputs = [
-    xz
-    unrar
-  ];
-  nativeBuildInputs = [
-    xz
-    pkg-config
-  ];
-  doCheck = false;
-}
+  src = pkgs.lib.cleanSource ../.;
+  buildInputs = [ pkgs.xz pkgs.unrar ];
+  nativeBuildInputs = [ pkgs.xz pkgs.pkg-config ];
+#  doCheck = false;
+}
\ No newline at end of file
diff --git a/src/lib/extractors.rs b/src/lib/extractors.rs
index bd64e86..cb7cd09 100644
--- a/src/lib/extractors.rs
+++ b/src/lib/extractors.rs
@@ -396,7 +396,7 @@ pub fn extract_deb(input_path: &Path,) -> Result<(),io::Error>{
         let mut entry = entry_result.unwrap();
         // Create a new file with the same name as the archive entry:
         let mut file = File::create(
-            std::str::from_utf8(entry.header().identifier()).unwrap(),
+            str::from_utf8(entry.header().identifier()).unwrap(),
         ).unwrap();
         // The Entry object also acts as an io::Read, so we can easily copy the
         // contents of the archive entry into the file: