adding 2015 & 2025 advents

2015/04/golang/.vscode/settings.json

@@ -0,0 +1,10 @@
+{
+    "[go]": {
+        "editor.insertSpaces": false,
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "golang.go",
+        "editor.codeActionsOnSave": {
+            "source.organizeImports": "explicit"
+        }
+    }
+}

2015/04/golang/go.mod

@@ -0,0 +1,3 @@
+module aoc/day-4
+
+go 1.24.4

2015/04/golang/main.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"fmt"
+	"strconv"
+)
+
+const key = "bgvyzdsv"
+
+func main() {
+	i := 0
+	var found = false
+	for !found {
+		hash := genMD5Hash(key + strconv.Itoa(i))
+		if hash[0:6] == "000000" {
+			found = true
+		} else {
+			i += 1
+		}
+	}
+	fmt.Println(i)
+}
+
+func genMD5Hash(text string) string {
+	hash := md5.Sum([]byte(text))
+	return hex.EncodeToString(hash[:])
+}