refactor: include generics based utility lib and refactor some parts accordingly [ci-skip]

utils/strings.go

@@ -8,12 +8,3 @@ import (
 func Capitalize(s string) string {
 	return fmt.Sprintf("%s%s", strings.ToUpper(s[:1]), s[1:])
 }
-
-func FindString(needle string, haystack []string, defaultVal string) string {
-	for _, s := range haystack {
-		if s == needle {
-			return s
-		}
-	}
-	return defaultVal
-}