feat: solve part one

internal/2016/DayOne/code.go

@@ -0,0 +1,56 @@
+package dayone
+
+import (
+	"os"
+	"strconv"
+	"strings"
+
+	"advent-of-code/internal/registry"
+)
+
+func init() {
+	registry.Register("2016D1", ParseInput, PartOne, PartTwo)
+}
+
+func abs(n int) int {
+	if n < 0 {
+		return -n
+	}
+	return n
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	parts := strings.Split(string(content), ",")
+	for i, p := range parts {
+		parts[i] = strings.TrimSpace(p)
+	}
+	return parts
+}
+
+func PartOne(data []string) int {
+	x, y := 0, 0
+	directions := [][]int{{0, 1}, {1, 0}, {0, -1}, {-1, 0}}
+	currentDirection := 0
+
+	for _, instruction := range data {
+		turn := instruction[0]
+		distance, _ := strconv.Atoi(instruction[1:])
+
+		switch turn {
+		case 'R':
+			currentDirection = (currentDirection + 1) % 4
+		case 'L':
+			currentDirection = (currentDirection + 3) % 4
+		}
+
+		x += directions[currentDirection][0] * distance
+		y += directions[currentDirection][1] * distance
+	}
+
+	return abs(x) + abs(y)
+}
+
+func PartTwo(data []string) int {
+	return 0
+}