Search for string with before and after limit

stringsearch.swift

        let limit = 13

        let queryString = "text"
        let targettedString = "Lorem Ipsum is simply dummy text of the printing and typesetting"
        let queryRange = targettedString.range(of: queryString)

        let distanceToStart = max(self.distance(from: queryRange.lowerBound, to: self.startIndex), -limit)
        let distanceToEnd = min(self.distance(from: queryRange.upperBound, to: self.endIndex), limit)
        
        let start = self.index(queryRange.lowerBound, offsetBy: distanceToStart)
        let end = self.index(queryRange.upperBound, offsetBy: distanceToEnd)
        
        var result = ""
        if start != self.startIndex {
            result.append("...")
        }
        
        result.append(contentsOf: self[start..<end])
        
        if end != self.endIndex {
            result.append("...")
        }