The code in the video is wrong

struct Point {
    let x: Int
    let y: Int

    init(x: Int, y: Int) {
        self.x = x
        self.y = y
    }

    func surroundingPoints(withRange range: Int = 1) -> [Point] {

        var result: [Point] = []

        for xCoord in (self.x-range)...(self.x+range) {
            for yCoord in (self.y-range)...(self.y+range) {
                result.append(Point(x: xCoord, y: yCoord))
            }
        }

        return result

    }
}

class Enemy {
    var life: Int = 100
    var position: Point

    init(x: Int, y: Int) {
        self.position = Point(x: x, y: y)
    }

    func decraeseHealth(factor: Int) {
        life -= factor
    }
}

class Tower {
    let position: Point
    var range: Int = 1
    var strength: Int = 1

    init(x: Int, y: Int) {
        self.position = Point(x: x, y: y)
    }

    func fireAtEnemy(enemy: Enemy) {
        if(inRange(enemy)) {
            while enemy.life > 0 {
                enemy.decraeseHealth(self.strength)
                if (enemy.life == 0) {
                    print("Enemy died")
                }
            }
        } else {
            print("Enemy is out of range");
        }
    }

    func inRange(enemy: Enemy) -> Bool {

        let target = enemy.position
        let availabePosition = position.surroundingPoints(withRange: range)

        for point in availabePosition {
            if (point.x == target.x) && (point.y == target.y) {
                return true
            }
        }
        return false
    }


}

let tower = Tower(x: 2, y: 2)
let enemy = Enemy(x: 1, y: 2)

tower.fireAtEnemy(enemy)