code: func IsSliceContainsStr(sl []string, str string) bool {
  	str = strings.ToLower(str)
  	for _, s := range sl {
  		if strings.ToLower(s) == str {
  			return true
  		}
  	}
  	return false
  }
docs: // IsSliceContainsStr returns true if the string exists in given slice.