rename files, added header guard, added namespace

src/include/base.hpp → src/include/utility.hpp

-#pragma once
+#ifndef CK_BASE_HPP
+#define CK_BASE_HPP
+
+namespace ck {
 
 __device__ index_t get_thread_local_1d_id() { return threadIdx.x; }
 
@@ -22,7 +25,7 @@ __host__ __device__ constexpr bool is_same_type(X, Y)
     return is_same<X, Y>::value;
 }
 
-namespace mod_conv { // namespace mod_conv
+namespace math { // namespace math
 template <class T, T s>
 struct scales
 {
@@ -110,4 +113,7 @@ __host__ __device__ constexpr T lcm(T x, Ts... xs)
     return max(x, xs...);
 }
 
-} // namespace mod_conv
+} // namespace math
+} // namspace ck
+
+#endif

src/include/vector_type.hpp

-#pragma once
-#include "config.h"
+#ifndef CK_VECTOR_TYPE_HPP
+#define CK_VECTOR_TYPE_HPP
+
+#include "config.hpp"
 #include "integral_constant.hpp"
 
+namespace ck {
+
 template <class T, index_t N>
 struct vector_type
 {
@@ -184,3 +188,7 @@ struct vector_type<char4, 2>
     using MemoryType = int64_t;
 };
 #endif
+
+} // namespace ck
+
+#endif