Arduino with VS Code plus PlatformIO equals Joy
Take advantage of Visual Studio Code to program your Arduino projects. Download VS Code at https://code.visualstudio.com/Download and be sure to install the Arduino for Visual Studio code and PlatformIO IDE once you've downloaded VS Code.
Also, when creating a project, be sure to not use spaces for the project title, and your code will be written in the src/main.cpp file. Finally, make sure you define any new functions before setup() and loop().
If you do all that, you should be fine. Good luck and good coding!