Implemented the CleanCommand command in the executable target.

Executable/Sources/Commands/CleanCommand.swift

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+import ArgumentParser
+import ColibriLibrary
+
+extension Colibri {
+    struct Clean: AsyncParsableCommand {
+        
+        // MARK: Properties
+        
+        static let configuration = CommandConfiguration(
+            commandName: "clean-project",
+            abstract: "Clean a Hummingbird app",
+            helpNames: .shortAndLong,
+            aliases: ["clean"]
+        )
+        
+        @OptionGroup var options: Options
+        
+        // MARK: Functions
+        
+        mutating func run() async throws {
+            let terminalService = TerminalService()
+            
+            let cleanProject = CleanProjectTask(terminalService: terminalService)
+
+            try await cleanProject(at: options.locationURL,
+                                   shouldReset: options.reset,
+                                   purgeCache: options.purgeCache)
+        }
+        
+    }
+}

Executable/Sources/Options/CleanOptions.swift

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+import ArgumentParser
+import ColibriLibrary
+
+extension Colibri.Clean {
+    struct Options: ParsableArguments, Locationable {
+        
+        // MARK: Properties
+        
+        @Flag(name: .shortAndLong)
+        var reset: Bool = false
+        
+        @Flag(name: .shortAndLong)
+        var purgeCache: Bool = false
+        
+        @Option(name: .shortAndLong)
+        var location: String?
+
+    }
+}