Refresh an Old app, simple but needs update.

I have an old Basic Camera App, it just zoomed the picture, I has old Android rules (SDK 22), and I need it upgraded to SDK 29 and fully working. App was developed in JAVA, however it has some codes in C, but is not a big deal. CURRENT data: compileSdkVersion 22 buildToolsVersion '25.0.0' targetSdkVersion 22 '[login to view URL]:gradle:3.0.0-alpha5' I need it as i said, API 29 working. I tried some time ago, however If Since its a CAMERA app, if I updated the API higher than 22, the camera wasnt working. Budget is low is tight, but I look for someone with experience who can complete this.