Utilities: Rename PreprocessorTest=>cpp-preprocessor

Userland/Utilities/cpp-preprocessor.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/File.h>
+#include <LibCpp/Preprocessor.h>
+
+int main(int, char**)
+{
+    auto file = Core::File::construct("/home/anon/Source/little/other.h");
+    if (!file->open(Core::OpenMode::ReadOnly)) {
+        perror("open");
+        exit(1);
+    }
+    auto content = file->read_all();
+    Cpp::Preprocessor cpp("other.h", StringView { content });
+    auto tokens = cpp.process_and_lex();
+    for (auto& token : tokens) {
+        dbgln("{}", token.to_string());
+    }
+}