External files, improve page generation

CHDataManagement/Extensions/Int+Random.swift

@@ -0,0 +1,7 @@
+
+extension Int {
+
+    static func random() -> Int {
+        random(in: Int.min...Int.max)
+    }
+}

CHDataManagement/Extensions/Sequence+Sorted.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-extension Sequence {
+extension Collection {
 
     func sorted<T>(ascending: Bool = true, using conversion: (Element) -> T) -> [Element] where T: Comparable {
         guard ascending else {

CHDataManagement/Extensions/String+Extensions.swift

@@ -9,6 +9,16 @@ extension String {
             .replacingOccurrences(of: ">", with: ">")
     }
 
+    var removingSurroundingQuotes: String {
+        if hasPrefix("\"") && hasSuffix("\"") {
+            return dropBeforeFirst("\"").dropAfterLast("\"")
+        }
+        if hasPrefix("'") && hasSuffix("'") {
+            return dropBeforeFirst("'").dropAfterLast("'")
+        }
+        return self
+    }
+
     var nonEmpty: String? {
         isEmpty ? nil : self
     }
@@ -30,7 +40,7 @@ extension String {
     /**
      Remove the part after the last occurence of the separator (including the separator itself).
 
-     The string is left unchanges, if it does not contain the separator.
+     The string is left unchanged, if it does not contain the separator.
      */
     func dropAfterLast(_ separator: String) -> String {
         guard contains(separator) else {