Fill the remainder of a string with blank spaces
<p>thank you for your support.
I have a string with, for example, 32 characters. For first, i want estabilish that the string have max 32 characters and i want add blank spaces if characters is only, for example, 9.</p>

<p>Example:</p>

<p>ABCDEFGHI ---> 9 characters</p>

<p>I want this:</p>

<p>ABCDEFGHI_<strong><em>_</em>__<em>_</em>__<em>_</em>__<em>_</em></strong> ---> 9 characters + 23 blank spaces added automatically.</p>

<p>Thank you</p>
