add daythree + benchmarks

day-03/internal/util/util.go

@@ -0,0 +1,25 @@
+package util
+
+import (
+	"regexp"
+	"strconv"
+)
+
+func GetGroups(r *regexp.Regexp, s string) map[string]string {
+	groups := make(map[string]string)
+	names := r.SubexpNames()
+	for i, res := range r.FindStringSubmatch(s) {
+		if i != 0 {
+			groups[names[i]] = res
+		}
+	}
+	return groups
+}
+
+func MustConv(s string) int {
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		panic(err)
+	}
+	return n
+}