Fix twitter links (#316)

Packages/Models/Sources/Models/Alias/HTMLString.swift

@@ -13,7 +13,22 @@ public struct HTMLString: Decodable, Equatable, Hashable {
   public init(from decoder: Decoder) {
     do {
       let container = try decoder.singleValueContainer()
-      htmlValue = try container.decode(String.self)
+      var tempHtmlValue = try container.decode(String.self)
+
+      let twitterUrl = "@twitter.com"
+      let twitPattern = #"@+[a-zA-Z0-9(_).-]{1,}@twitter.com"#
+      let regex = try Regex(twitPattern)
+
+      for twitterRange in tempHtmlValue.ranges(of: regex).reversed() {
+        let unparsedHandle = tempHtmlValue[twitterRange.lowerBound...twitterRange.upperBound]
+        let twitterHandle = unparsedHandle.dropFirst().dropLast(twitterUrl.count + 1)
+        let twitterUrlString = "<a href=\"https://twitter.com/\(twitterHandle)\">\(unparsedHandle)</a>"
+
+        tempHtmlValue = tempHtmlValue.replacingOccurrences(of: unparsedHandle, with: twitterUrlString, options: .caseInsensitive,
+                                                           range: twitterRange.lowerBound..<tempHtmlValue.endIndex)
+      }
+
+      htmlValue = tempHtmlValue
     } catch {
       htmlValue = ""
     }