feat: day 1 first part done

internal/common/common.go

@@ -0,0 +1,35 @@
+package common
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func Must[T any](obj T, err error) T {
+	if err != nil {
+		log.Fatal(err)
+	}
+	return obj
+}
+
+func LoadInputs(input string) []string {
+	fmt.Println("Opening file...")
+	bytes := Must(os.ReadFile("././inputs/" + input))
+	content := strings.Split(string(bytes), "\n")
+	return content[:len(content)-1]
+}
+
+func SumIntArr(arr []int) int {
+	sum := 0
+	for _, v := range arr {
+		sum += v
+	}
+	return sum
+}
+
+func StrToInt(str string) int {
+	return Must(strconv.Atoi(str))
+}