Removing duplicates and white space between entries

hi experts

I have a Product name column on my UI grid which has data like this


CRBR
CRBR
CRBR
CRBR
CRBR
TESTRAMP
TESTRAMP
TESTRAMP
TESTRAMP
TESTRAMP
OLIVERP
OLIVERP
OLIVERP
OLIVERP

My requirment is to remove duplicates and remove the white space between each product
Currently i have productRenderer on this column

var  productPlaceHolder = {};
function productRenderer(value, meta) {    
    if( !productPlaceHolder[value] ) {  
        productPlaceHolder[value] = true;        
        return value;
    }
    else {
        return  ''; //removes duplicates
    }
}

After i apply the renderer, it displays like this
CRBR




TESTRAMP




OLIVERP




But my requirment is to display like this
CRBR
TESTRAMP
OLIVERP

Any idea how i can remove the white spaces?

Thanks