How to Display the button and fontawesome icon in same line

How to Display the button and fontawesome icon in same line

<br>

.add-cart-button
{
    width:205px;
    height:56px;
    border-radius: 28px;
    background-color: #EC7F4A;
    color: #ffff;
    font-family: Roboto;
}
.add-cart-button-icon
{
    color: #232323;
    float: right;
    font-size: 40px;
}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

  <button  class="add-cart-button">
    <span>Add to Cart</span><i class="fa fa-plus-circle fa-6  add-cart-button-icon" aria-hidden="true"></i>
   </button>


I'm using Bootstrap4 doubt in button that i need to display button along with fontawosome icon.can any one please tell me to do it.

Expected image

Actual output i got now

Image of Actual output i got now

html5 css3 bootstrap

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