To try the app you can clone the project and go to installers and install it or just install it from here :
https://github.com/harumans/CaseConverter-UI/releases/download/v1.0/Converter.exe
I made this application to edit my text form, the application have three main functions:
UpperCase : Makes your text UPPERCASE.
LowerCase : Makes your text lowercase.
Capitalize : Capitalizes your text.
In case you want to edit the source code make a flutter project and replace your lib folder with the project's lib.
In the future i will make the ui batter and probably add more features. I hope u like it.