feat: add part one solution

internal/2020/DayEight/code.go

@@ -0,0 +1,67 @@
+package dayeight
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type instruction struct {
+	operation string
+	argument  int
+}
+
+func init() {
+	registry.Register("2020D8", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) []string {
+	content, _ := os.ReadFile(filepath)
+	return strings.Split(string(content), "\n")
+}
+
+func parseInstructions(data []string) []instruction {
+	instructions := make([]instruction, 0, len(data))
+	for _, line := range data {
+		line = strings.TrimSpace(line)
+		parts := strings.Fields(line)
+		if len(parts) != 2 {
+			continue
+		}
+		arg, _ := strconv.Atoi(parts[1])
+		instructions = append(instructions, instruction{operation: parts[0], argument: arg})
+	}
+	return instructions
+}
+
+func PartOne(data []string) int {
+	instructions := parseInstructions(data)
+	visited := make(map[int]bool)
+	accumulator := 0
+	pc := 0
+
+	for pc < len(instructions) {
+		if visited[pc] {
+			return accumulator
+		}
+		visited[pc] = true
+
+		instruction := instructions[pc]
+		switch instruction.operation {
+		case "acc":
+			accumulator += instruction.argument
+			pc++
+		case "jmp":
+			pc += instruction.argument
+		case "nop":
+			pc++
+		}
+	}
+
+	return accumulator
+}
+
+func PartTwo(data []string) int {
+	return 0
+}