let index = str.index(str.startIndex, offsetBy: 9);
//from
let s = str.substring(from: index);
//to
let s1 = str.substring(to: index);
//with
let start = str.index(str.startIndex, offsetBy: 7);
let end = str.index(str.endIndex, offsetBy: -3);
var ran = Range(uncheckedBounds: (start,end));
str.substring(with: ran)
