diff --git a/.envrc b/.envrc
deleted file mode 100644
index 3550a30f2de389e537ee40ca5e64a77dc185c79b..0000000000000000000000000000000000000000
--- a/.envrc
+++ /dev/null
@@ -1 +0,0 @@
-use flake
diff --git a/01/.vscode/launch.json b/day01/.vscode/launch.json
similarity index 100%
rename from 01/.vscode/launch.json
rename to day01/.vscode/launch.json
diff --git a/01/Cargo.lock b/day01/Cargo.lock
similarity index 100%
rename from 01/Cargo.lock
rename to day01/Cargo.lock
diff --git a/01/Cargo.toml b/day01/Cargo.toml
similarity index 100%
rename from 01/Cargo.toml
rename to day01/Cargo.toml
diff --git a/01/data.txt b/day01/data.txt
similarity index 100%
rename from 01/data.txt
rename to day01/data.txt
diff --git a/day01/flake.lock b/day01/flake.lock
new file mode 100644
index 0000000000000000000000000000000000000000..1846e2c6369346f2783c86c5d7b03dd8bac23d2b
--- /dev/null
+++ b/day01/flake.lock
@@ -0,0 +1,83 @@
+{
+  "nodes": {
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1701268161,
+        "narHash": "sha256-hL4jGGwMHHmyx6G9wi6IrYa8RLkoEtzCb4zWITH1B40=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "67be70a859530f6f7c358568eaa6ab0d84b36b01",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/day01/flake.nix b/day01/flake.nix
new file mode 100644
index 0000000000000000000000000000000000000000..70189f0356a98da5c89c7e72a40b9ab6ff0edd88
--- /dev/null
+++ b/day01/flake.nix
@@ -0,0 +1,29 @@
+{
+  description = "AoC 2023 - day 01";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    naersk = {
+      url = "github:nix-community/naersk/master";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils, naersk }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        naerskBuildPackage = (conf:
+          (pkgs.callPackage naersk { }).buildPackage ({ src = ./.; } // conf)
+        );
+      in
+      {
+        defaultPackage = naerskBuildPackage { };
+
+        devShell = with pkgs; mkShell {
+          buildInputs = buildInputs ++ [ cargo rustc rustfmt ];
+          RUST_SRC_PATH = rustPlatform.rustLibSrc;
+        };
+      });
+}
diff --git a/day01/result b/day01/result
new file mode 120000
index 0000000000000000000000000000000000000000..f48266c4ed877aeffb724afca92e5c267f9da2dd
--- /dev/null
+++ b/day01/result
@@ -0,0 +1 @@
+/nix/store/cbbfxpl8bq6vpnb98mfq9qgfg1phr3nz-aoc-0.1.0
\ No newline at end of file
diff --git a/01/src/main.rs b/day01/src/main.rs
similarity index 100%
rename from 01/src/main.rs
rename to day01/src/main.rs
diff --git a/flake.lock b/flake.lock
index 1846e2c6369346f2783c86c5d7b03dd8bac23d2b..3c57e549381befb8425c2bca9981124551673777 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,6 +1,47 @@
 {
   "nodes": {
+    "day01": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": "utils"
+      },
+      "locked": {
+        "lastModified": 1,
+        "narHash": "sha256-Skcd0y3BZ27ycrNGxmHcMyGRPat8mYU0IXM1Lc/174I=",
+        "path": "/nix/store/lylqmpv4yipaapna82jpnmsxd7r4m82q-source/day01",
+        "type": "path"
+      },
+      "original": {
+        "path": "/nix/store/lylqmpv4yipaapna82jpnmsxd7r4m82q-source/day01",
+        "type": "path"
+      }
+    },
     "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "day01",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1698420672,
+        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "aeb58d5e8faead8980a807c840232697982d47b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "naersk_2": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
@@ -39,9 +80,10 @@
     },
     "root": {
       "inputs": {
-        "naersk": "naersk",
+        "day01": "day01",
+        "naersk": "naersk_2",
         "nixpkgs": "nixpkgs",
-        "utils": "utils"
+        "utils": "utils_2"
       }
     },
     "systems": {
@@ -59,6 +101,21 @@
         "type": "github"
       }
     },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "utils": {
       "inputs": {
         "systems": "systems"
@@ -76,6 +133,24 @@
         "repo": "flake-utils",
         "type": "github"
       }
+    },
+    "utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
     }
   },
   "root": "root",
diff --git a/flake.nix b/flake.nix
index 3632c44b795f5fea7e3ed3a6f39f2192ed75e00d..aa76ced47193636b7d44a5e6cab7ea493a667fae 100644
--- a/flake.nix
+++ b/flake.nix
@@ -3,6 +3,10 @@
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    day01 = {
+      url = "./day01";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     naersk = {
       url = "github:nix-community/naersk/master";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -10,27 +14,12 @@
     utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, utils, naersk }:
+  outputs = { self, nixpkgs, utils, naersk, day01 }:
     utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
-        buildInputs = with pkgs; [ perl ];
-
-        naerskBuildPackage = (conf: (
-          (pkgs.callPackage naersk { }).buildPackage (
-            {
-              src = ./.;
-              inherit buildInputs;
-            } // conf
-          )
-        ));
       in
       {
-        packages."01" = naerskBuildPackage { src = ./01/.; };
-
-        devShell = with pkgs; mkShell {
-          buildInputs = buildInputs ++ [ cargo rustc rustfmt rustPackages.clippy ];
-          RUST_SRC_PATH = rustPlatform.rustLibSrc;
-        };
+        packages.day01 = day01.defaultPackage.${system};
       });
 }
diff --git a/result b/result
new file mode 120000
index 0000000000000000000000000000000000000000..81f84c0ade76ceabb4c60ac8fa923ea0139f241e
--- /dev/null
+++ b/result
@@ -0,0 +1 @@
+/nix/store/bmsr9z02zcchqqij4ai42b327qg32zyv-aoc-0.1.0
\ No newline at end of file