string.go
func StringFilter(f func(string) bool, data []string) []string {
	result := make([]string, 0, 0)
	for _, element := range data {
		if f(element) {
			result = append(result, element)
		}
	}
	return result
}
func StringFilter(f func(string) bool, data []string) []string {
	result := make([]string, 0, 0)
	for _, element := range data {
		if f(element) {
			result = append(result, element)
		}
	}
	return result
}
// Filter out all strings where the function does not return true.