feat: add both solutions

internal/2015/DayFive/code.go

@@ -0,0 +1,77 @@
+package dayfive
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strings"
+)
+
+func init() {
+	registry.Register("2015D5", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	return strings.Split(string(content), "\n")
+}
+
+func PartOne(data []string) int {
+	count := 0
+	for _, line := range data {
+		vowelCount := strings.Count(line, "a") + strings.Count(line, "e") + strings.Count(line, "i") + strings.Count(line, "o") + strings.Count(line, "u")
+		if vowelCount < 3 {
+			continue
+		}
+
+		hasDoubleLetter := false
+		for i := 1; i < len(line); i++ {
+			if line[i] == line[i-1] {
+				hasDoubleLetter = true
+				break
+			}
+		}
+		if !hasDoubleLetter {
+			continue
+		}
+
+		if strings.Contains(line, "ab") || strings.Contains(line, "cd") || strings.Contains(line, "pq") || strings.Contains(line, "xy") {
+			continue
+		}
+
+		count++
+	}
+	return count
+}
+
+func PartTwo(data []string) int {
+	count := 0
+	for _, line := range data {
+		if len(line) < 4 {
+			continue
+		}
+
+		hasNonOverlappingPair := false
+		for i := 0; i < len(line)-1; i++ {
+			pair := line[i : i+2]
+			if strings.Contains(line[i+2:], pair) {
+				hasNonOverlappingPair = true
+				break
+			}
+		}
+		if !hasNonOverlappingPair {
+			continue
+		}
+
+		hasRepeatingLetterWithGap := false
+		for i := 0; i < len(line)-2; i++ {
+			if line[i] == line[i+2] {
+				hasRepeatingLetterWithGap = true
+				break
+			}
+		}
+		if hasRepeatingLetterWithGap {
+			count++
+		}
+	}
+	return count
+}