move exmple/c/* to example/

example/c/cmake/CMakeLists.txt => example/cmake/CMakeLists.txt
example/c/lib_buffer_unpack.c => example/lib_buffer_unpack.c
example/c/simple_c.c => example/simple_c.c
example/c/speed_test_uint32_array.c => example/speed_test_uint32_array.c
example/c/speed_test_uint64_array.c => example/speed_test_uint64_array.c
example/c/user_buffer_unpack.c => example/user_buffer_unpack.c

Use `git log --follow example/filename` to see full log

example/speed_test_uint32_array.c

@@ -0,0 +1,36 @@
+#include <msgpack.h>
+
+void test()
+{
+    size_t size = 10000000;
+    msgpack_sbuffer buf;
+    msgpack_packer * pk;
+    size_t upk_pos = 0;
+    msgpack_unpacked msg;
+
+    msgpack_sbuffer_init(&buf);
+
+    pk = msgpack_packer_new(&buf, msgpack_sbuffer_write);
+
+    msgpack_pack_array(pk, size);
+    {
+        size_t idx = 0;
+        for (; idx < size; ++idx)
+            msgpack_pack_uint32(pk, 1);
+    }
+    msgpack_packer_free(pk);
+
+    msgpack_unpacked_init(&msg);
+
+    while (msgpack_unpack_next(&msg, buf.data, buf.size, &upk_pos) == MSGPACK_UNPACK_SUCCESS) {
+    }
+
+    msgpack_sbuffer_destroy(&buf);
+}
+
+int main(void)
+{
+    int i = 0;
+    for (; i < 10; ++i) test();
+    return 0;
+}