JSFiddle - React, Tailwind, and code Playground

HTML

<form name="Test" onsubmit="return false;">
    <input type="text" name="In1" value="1  23  "/>
    <input type="text" name="In2" value="45  6  " />
    <input type="text" name="In3" value="789  " />
    <input type="text" name="In4" value="101  " />
    <input type="submit" name="Enter" value="Enter" onclick="document.Test.Result.value = func()"/>
    <textarea name="Result"></textarea>
</form>

CSS

input {
    display: block;
}

JavaScript

function func() {
    var str="";
    for (var i = 0, j = document.Test.elements.length; i < j; i++)
        if ( document.Test.elements[i].type == "text") 
            str += document.Test.elements[i].value.replace(/  $/, " ");
    console.log(str);
    return str;
}