feat: solve part one

internal/2017/DayOne/code.go

@@ -0,0 +1,37 @@
+package dayone
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strconv"
+)
+
+func init() {
+	registry.Register("2017D1", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []int {
+	content, _ := os.ReadFile(filepath)
+	digits := string(content)
+	result := make([]int, 0, len(digits))
+	for _, char := range digits {
+		digit, _ := strconv.Atoi(string(char))
+		result = append(result, digit)
+	}
+	return result
+}
+
+func PartOne(data []int) int {
+	sum := 0
+	for idx := range data {
+		nextIndex := (idx + 1) % len(data)
+		if data[idx] == data[nextIndex] {
+			sum += data[idx]
+		}
+	}
+	return sum
+}
+
+func PartTwo(data []int) int {
+	return 0
+}