So is there any way to remove the file?

Hi. I have successfully finished making a smart mirror. Now I actually want a voice assistant which can be used to interact with the smart mirror. So I have decided to integrate alexapi into my smart mirror. This is the actual link from where I want to download alexapi :- (https://github.com/alexa-pi/AlexaPi/wiki/Installation)
So while I was installing this, By mistakely I have closed the terminal so again when I tried to run the script, it was unable to execute so I decided to remove the file which I have cloned earlier while downloading the alexapi. This was the repo which I have cloned :- (sudo git clone https://github.com/alexa-pi/AlexaPi.git). I have cloned this repo inside opt directory. So now my main problem is that as I have mentioned above that due to some reason I wanted to delete this file but I am unable to do so. The reason to delete the alexapi file is because I want to reinstall the alexapi. So when I again tried to clone the repo inside opt file, I am getting a error that the file you want to clone already exists and the directory is also not empty so I have decided to delete the previous alexapi file but I was not able to remove the file. I always get the error that the file was deleted with errors and again when I go back and check that is the file deleted or no, so the answer is its not deleted. When I try to remove the file it says me this error that the file was deleted with errors. I hope you understood my problem. Please help me with it.
Thanks in advance,
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