!6049 Replace unsafe function "memcpy" with "memcpy_s"

Merge pull request !6049 from maning202007/restore_debugger

mindspore/ccsrc/debug/debugger/grpc_client.cc

@@ -79,7 +79,10 @@ std::vector<std::string> ChunkString(std::string str, int graph_size) {
     }
     std::string buffer;
     buffer.resize(chunk_size);
-    memcpy(reinterpret_cast<char *>(buffer.data()), str.data() + size_iter, chunk_size);
+    errno_t err = memcpy_s(reinterpret_cast<char *>(buffer.data()), chunk_size, str.data() + size_iter, chunk_size);
+    if (err != 0) {
+      MS_LOG(ERROR) << "memcpy_s failed. err code is: " << err;
+    }
     buf.push_back(buffer);
     size_iter += CHUNK_SIZE;
   }