refactor: massive refactor to have only one binary to call

internal/2021/DayOne/code.go

@@ -0,0 +1,43 @@
+package dayone
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func init() {
+	registry.Register("2021D1", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []int {
+	content, _ := os.ReadFile(filepath)
+	var data []int
+	for line := range strings.SplitSeq(string(content), "\n") {
+		num, _ := strconv.Atoi(line)
+		data = append(data, num)
+	}
+	return data
+}
+
+func PartOne(data []int) int {
+	count := 0
+	for i := 1; i < len(data); i++ {
+		if data[i] > data[i-1] {
+			count++
+		}
+	}
+	return count
+}
+
+func PartTwo(data []int) int {
+	count := 0
+	for i := 3; i < len(data); i++ {
+		if data[i] > data[i-3] {
+			count++
+		}
+	}
+	return count
+}
+