let string = "0123456789" let substring1 = string.dropLast(3) // "0123456" let substring2 = substring1.dropLast() // "012345" let result = String(substring2.dropLast()) // "01234"
let string = "0123456789" let substring1 = string.dropLast(3) // "0123456" let substring2 = substring1.dropLast() // "012345" let result = String(substring2.dropLast()) // "01234"