i found bitcoin wallet I need qr private key where i can get that code? i found bitcoin wallet I need qr private key where i can get that code ? 
Is it impossible to get qr private code ?
I need qr private key

QR codes are a 2D barcode typically used by cryptocurrency wallets to present a payment-address which someone else uses to send you payment. They are also sometimes used when printing a private-key as a paper wallet.

where i can get that code?

Non-custodial wallets generally provide a means to extract the private-key. For example with Bitcoin-core you can use the CLI command dumpprivkey
Most wallets are protected by a pass-phrase. If you don't know the pass-phrase, and can't guess it, you cannot extract the private-key.

If you believe the private-key was printed in QR-barcode form as a paper-wallet it will obviously be wherever the owner put it - we can't really help with that.

Found wallet
You have no access to the Bitcoins associated with a wallet if you don't have the wallet's passphrase and dont have the private-key and don't know where it is in printed form and don't know a seed-phrase used to generate the private keys.

Converting a private-key from text to QR-code
If you have full-access to the wallet you found and want to convert it to a paper wallet in QR-code form - you'll need the wallet to support that or export the private key in other form (e.g. WIF) and then import it into software (perhaps a different wallet) that has the features you need.
For those comfortable with programming, I've seen people suggest downloading the HTML from, say, https://www.bitaddress.org and running that on a disconnected PC. It looks like client-side Javascript and can generate QR-codes from a known private-key with some modification. The Javascript libraries used appear to be open-source so can be obtained from the usual repositories.