feat: solve day 1 part 1

cmd/01/main.go

@@ -1,5 +1,28 @@
 package main
 
+import (
+	"github.com/StevanFreeborn/advent-of-code-2025/cmd/01/dial"
+	"github.com/StevanFreeborn/advent-of-code-2025/cmd/01/instruction"
+	"github.com/StevanFreeborn/advent-of-code-2025/internal/file"
+)
+
 func SolvePartOne(filePath string) int {
-	return 0
+	lines := file.ReadLines(filePath)
+	dial := dial.New()
+	total := 0
+
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+
+		instruction := instruction.FromLine(line)
+		dial.Turn(instruction)
+
+		if dial.Value() == 0 {
+			total++
+		}
+	}
+
+	return total
 }