<Router>
는 최상위에만 있어야함<Router>
<Switch>
<Route exact path="/Login" component={Login} />
<Route exact path="/MyPage" component={MyPage} />
<Route path="/SignUp" component={SignUp} />
</Switch>
</Router>
<Switch>
<Route path="/SignUp/Privacy" component={Privacy} />
<Route path="/SignUp/Terms" component={Terms} />
<Route path="/SignUp/Account" component={Account} />
<Route path="/SignUp/Complete" component={Complete} />
</Switch>