var v = "023030333830303630313233343536373839303132333435363738393031323334353637383930303030303030303030303030303030303030303030303030313233343536373833313230323231313039303030303132333430303030303030303030303030313030313033314303";

var nv = "";
var flag = false
for ( let vv of v ) {
    nv += vv;
    if ( flag ) {
        nv += " "
        flag =false
    } else {
        flag = true
    }
}
console.log( nv )