First version

WebsiteGenerator/Extensions/Optional+Extensions.swift

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+import Foundation
+import Metal
+
+extension Optional {
+
+    func unwrapped<T>(_ closure: (Wrapped) -> T) -> T? {
+        if case let .some(value) = self {
+            return closure(value)
+        }
+        return nil
+    }
+}

WebsiteGenerator/Extensions/String+Extensions.swift

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+import Foundation
+
+extension String {
+
+    var nonEmpty: String? {
+        self.isEmpty ? nil : self
+    }
+
+    var trimmed: String {
+        trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+
+    func indented(by indentation: String) -> String {
+        components(separatedBy: "\n").joined(separator: "\n" + indentation)
+    }
+
+    var withoutEmptyLines: String {
+        components(separatedBy: "\n")
+            .filter { !$0.trimmed.isEmpty }
+            .joined(separator: "\n")
+    }
+
+    func dropAfterLast(_ separator: String) -> String {
+        components(separatedBy: separator).dropLast().joined(separator: separator)
+    }
+
+    func dropBeforeFirst(_ separator: String) -> String {
+        components(separatedBy: separator).dropFirst().joined(separator: separator)
+    }
+
+    func lastComponentAfter(_ separator: String) -> String {
+        components(separatedBy: separator).last!
+    }
+
+    func insert(_ content: String, beforeLast separator: String) -> String {
+        let parts = components(separatedBy: separator)
+        return parts.dropLast().joined(separator: separator) + content + separator + parts.last!
+    }
+}