func toLower0(s *string) {
//
if len(*s) == 0 {
return
}
*s = string(z.Lower((*s)[0])) + (*s)[1:]
}
func toLower(s *string) {
//
n := len(*s)
b := make([]byte, n)
for i := 0; i < n; i++ {
b[i] = z.Lower((*s)[i])
}
*s = string(b)
}