BigSort.swift

func bigSorting(unsorted: [String]) -> [String] {
    let strings = unsorted.sorted { (left, right) -> Bool in
        if left.count > right.count {
            return false
        }
        if left.count < right.count {
            return true
        }

        if let l = Int(left), let r = Int(right) {
            if l > r {
                return false
            } else if l < r {
                return true
            }
        }

        for i in 0..<left.count {
            let leftValue = left[left.index(left.startIndex, offsetBy: i)]
            let rightValue = right[right.index(right.startIndex, offsetBy: i)]
            if leftValue > rightValue {
                return false
            } else if leftValue < rightValue {
                return true
            }
        }
        return false
    }
    return strings
}