Unexpected multiple spaces instead of one in figure caption

I am facing an issue with image caption when I tried to add a source to it. I don’t want the source to show in listoffigures. The way I found to achieve it, is by adding command

newcommand*{captionsource}[2]{%
  caption[{#1}]{%
    #1%
    hspace{linewidth}%
    {Źródło:} #2%
  }%
}

and then in my file, I use it as follow

begin{figure}[h]
centering
includegraphics[scale=0.65]{arduino}
captionsource{Opis wejść oraz wyjść Arduino Nano 33 BLE}{url{https://content.arduino.cc/assets/Pinout-NANOble_latest.pdf}}
label{fig:arduino}
end{figure}

But instead of expected

Figure 1: Caption (This works as it should)
Source: My_Url (Here I Want one space between the colon and my URL, which doesn't work)

I either get no spaces in source if I’ll remove the single space from the command captionsource in line {Źródło:} #2%, and the link is glued to the colon (Source:My_Url) or single space results in this:

It’s my first paper in Latex, I hope you can help me since I can’t find the solution by myself.