Paste an entire cut line at the end of another line in vim

To cut a line without new line, you can press d$ or D from cursor location. To paste it at the end of another line, you can go to its end and just press p. In case, if you are not able to paste the line as you expected, you can go to the end of line where you wanted to paste. Then, press i and then press <C-R> (Control-R) and " (double quotes). Your recently cut or copied text will be pasted.

After you pasted your line after your current one via p just press another j in your previous line to join the two lines, thus eliminating your unwanted line feed...