feat: solve day 3 part 1

cmd/03/main.go

@@ -0,0 +1,18 @@
+package main
+
+import (
+	"github.com/StevanFreeborn/advent-of-code-2025/cmd/03/bank"
+	"github.com/StevanFreeborn/advent-of-code-2025/internal/file"
+)
+
+func SolvePartOne(filePath string) int {
+	input := file.ReadLines(filePath)
+	total := 0
+
+	for _, line := range input {
+		bank := bank.From(line)
+		total += bank.Joltage()
+	}
+
+	return total
+}