refactor: massive refactor to have only one binary to call

internal/2020/DayTwo/code.go

@@ -0,0 +1,77 @@
+package daytwo
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func init() {
+	registry.Register("2020D2", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	lines := strings.Split(string(content), "\n")
+	var data []string
+	for _, line := range lines {
+		data = append(data, line)
+	}
+	return data
+}
+
+func PartOne(data []string) int {
+	valid := 0
+	for _, line := range data {
+		if line == "" {
+			continue
+		}
+		parts := strings.Split(line, ": ")
+		policy := parts[0]
+		password := parts[1]
+
+		policyParts := strings.Split(policy, " ")
+		rangeStr := policyParts[0]
+		letter := policyParts[1]
+
+		rangeParts := strings.Split(rangeStr, "-")
+		min, _ := strconv.Atoi(rangeParts[0])
+		max, _ := strconv.Atoi(rangeParts[1])
+
+		count := strings.Count(password, letter)
+		if count >= min && count <= max {
+			valid++
+		}
+	}
+	return valid
+}
+
+func PartTwo(data []string) int {
+	valid := 0
+	for _, line := range data {
+		if line == "" {
+			continue
+		}
+		parts := strings.Split(line, ": ")
+		policy := parts[0]
+		password := parts[1]
+
+		policyParts := strings.Split(policy, " ")
+		rangeStr := policyParts[0]
+		letter := policyParts[1]
+
+		rangeParts := strings.Split(rangeStr, "-")
+		firstPosition, _ := strconv.Atoi(rangeParts[0])
+		secondPosition, _ := strconv.Atoi(rangeParts[1])
+
+		atFirstPosition := len(password) >= firstPosition && password[firstPosition-1] == letter[0]
+		atSecondPosition := len(password) >= secondPosition && password[secondPosition-1] == letter[0]
+
+		if atFirstPosition != atSecondPosition {
+			valid++
+		}
+	}
+	return valid
+}
+