title: How to add minus sign in front of a string? (In C)
body: <p>My string length is constant but actual data length will vary as like below,</p>
  
  <pre><code>"           1,54" // will be displayed as "- 1,54"
  "123456789012,12" // will be dsiplayed as "- 123456789012,12"
  </code></pre>