Not being able to start on Windows

[PtkHReis]

I'm trying to start the program after installing on my Windows terminal, but I get this error

yarn run v1.22.17
$ yarn start:testnet
$ cp ./config/testnet.json src/config.json && react-scripts start
'cp' is not recognized as an internal or external command,
operable program or batch file.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Does anyone know a fix?

[Aryan-goel]

change cp to copy and replace every "/" with "\" in the package.json and try to use it on mainnet as testnet uses florencenet