import PackageDescription

let package = Package(
    // ...
    dependencies: [
        // ...
        .Package(url: "https://github.com/decryptOS/Levenshtein.git", majorVersion: 0, minor: 1),
        // ...
    ]
)

import Levenshtein

// ...

let a = "Apple"
let b = "Apples"
assert(levenshteinDistance(a, b) == 1)
// 1 because 1 change is necessary to transform between a and b