title: string to binary
body: <p>I convert a character to binary using <code>std::bitset&lt;CHAR_BIT&gt; binary('c');</code>
  but this doesn't work for a string,</p>
  
  <pre><code>std::string str = "MyString";
  std::bitset&lt;SIZE_OF_STRING_IN_BITS&gt; binary(str); //Error Exception
  </code></pre>
  
  <p>what should be the alternative?</p>