title: Convert a vector<int> to string with fmt library
body: <p>How to remove {} from the output?</p>
  
  <pre><code>#include &lt;iostream&gt;
  #include &lt;vector&gt;
  #include &lt;fmt/format.h&gt;
  #include &lt;fmt/ranges.h&gt;
  int main () {
      std::vector&lt;int&gt; v = {1,2,3};
      std::string s = fmt::format("{}", v);
      std::cout &lt;&lt; s &lt;&lt; '\n'; // output : {1, 2, 3}
      return 0;
  }
  </code></pre>
  
  <p>how to remove '{' and '}' in output for the above code and only print : 1, 2, 3</p>