diff --git a/src/tool.h b/src/tool.h
new file mode 100644
index 0000000..9555959
--- /dev/null
+++ b/src/tool.h
@@ -0,0 +1,17 @@
+#ifndef TOOL_H
+#define TOOL_H
+
+#include<string>
+#include<vector>
+
+namespace tool{
+    std::vector<std::string>split(const std::string& str);
+
+    bool isNumber(const std::string& str);
+
+    std::string getCurrentTime();
+
+    std::string EreaseEmpty(const std::string& question);
+}
+
+#endif
\ No newline at end of file