Introduce Exec interface and implementers (#1)

Reviewed-on: #1

util/util.go

@@ -0,0 +1,21 @@
+package util
+
+import (
+	"strings"
+	"unicode"
+)
+
+func CamelToSnake(str string) string {
+	var snake strings.Builder
+	isPrevUpper := true
+	for _, c := range str {
+		if unicode.IsUpper(c) && !isPrevUpper {
+			snake.WriteString("_" + string(unicode.ToUpper(c)))
+			isPrevUpper = true
+		} else {
+			snake.WriteString(string(unicode.ToUpper(c)))
+			isPrevUpper = unicode.IsUpper(c)
+		}
+	}
+	return snake.String()
+}