Reorganize files, Part 1 (#119)

* delete obselete files

* move files

* build

* update cmake

* update cmake

* fix build

* reorg examples

* update cmake for example and test

include/ck/utility/c_style_pointer_cast.hpp

@@ -0,0 +1,22 @@
+#ifndef CK_C_STYLE_POINTER_CAST_HPP
+#define CK_C_STYLE_POINTER_CAST_HPP
+
+#include "type.hpp"
+#include "enable_if.hpp"
+
+namespace ck {
+
+template <typename PY,
+          typename PX,
+          typename enable_if<is_pointer_v<PY> && is_pointer_v<PX>, bool>::type = false>
+__host__ __device__ PY c_style_pointer_cast(PX p_x)
+{
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wold-style-cast"
+#pragma clang diagnostic ignored "-Wcast-align"
+    return (PY)p_x; // NOLINT(old-style-cast, cast-align)
+#pragma clang diagnostic pop
+}
+
+} // namespace ck
+#endif