add day-02 + benchmarks

day-02/internal/util/util.go

@@ -0,0 +1,22 @@
+package util
+
+import (
+	"strconv"
+	"strings"
+)
+
+func MustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}
+
+func IntsFromString(s string) []int {
+	nums := []int{}
+	for _, r := range strings.Fields(s) {
+		nums = append(nums, MustConv(r))
+	}
+	return nums
+}