Split single column list to two columns list

split.swift

let list = raw.components(separatedBy: "\n")
let limit = list.count/2
var formatted = ""
for (index, item) in list.enumerated() {
    guard index < limit else { continue }
    formatted.append(item)
    formatted.append("\t")
    formatted.append(list[index + limit])
    formatted.append("\n")
}