I want to trim whitespaces in a form, so you cant write spaces as a name and submit.

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i want to trim whitespaces in a form, so you cant write spaces as a name and submit.
Down there is my form. Thanks for the help if you understand what i mean.

What I have tried:

<form name='obrazec' method='post' action='index.php'>
    Registracija<br>
    Vnesi ime: <input type="text" id="username" name="ime"> <br>
    Vnesi geslo: <input type="password" name="geslo"> <br>
    Ponovi geslo: <input type="password" name="ponovi_geslo"> <br>
    <input name="gumb" type="submit" value="Pritisni me">
  </form>