func StrAppendUnique(vs []string, toAdd string) []string {
	if StrInclude(vs, toAdd) {
		return vs
	}

	return append(vs, toAdd)
}
// StrAppendUnique appends toAdd to the vs string slice if toAdd does not already
// exist in the slice. It returns the new or unchanged string slice.
StrAppendUnique appends toAdd to the vs string slice if toAdd does not already
exist in the slice. It returns the new or unchanged string slice.
// StrAppendUnique appends toAdd to the vs string slice if toAdd does not already // exist in the slice . It returns the new or unchanged string slice .
func StrAppendUnique(vs []string, toAdd string) []string {
	if StrInclude(vs, toAdd) {
		return vs
	}
	return append(vs, toAdd)
}
func StrAppendUnique ( vs [ ] string , toAdd string ) [ ] string { if StrInclude ( vs , toAdd ) { return vs } return append ( vs , toAdd ) }
StrAppendUnique appends toAdd to the vs string slice if toAdd does not already
exist in the slice.
StrAppendUnique appends toAdd to the vs string slice if toAdd does not already exist in the slice .