Old timer here! As many others replying to you indicate, Ctrl+C means SIGINT (interrupt running program). Many have offered the Ctrl+Shift+C, but back in my day, we used Shift+Insert (paste) and Ctrl+Insert (copy). They still work today, but Linux has 2 clipboard buffers and Shift+Insert works against the primary.
As an aside, on Wayland, you can use wl-paste and wl-copy in your commands, so git clone “$(wl-paste)” will clone whatever repo you copied to your clipboard. I use this one all the time