When I copy your code into an m file, I instantly see an error at this line. I assume you're getting that error, too.
function WorkingDir = getcurrentdir
If you are treating this file as a function file, either all or none of the functions must end with an end. However, it seems that startupfcn() is the main function and the other functions are nested. In that case, none of the functions need an end.
For more info on function files, local functions, and nested function, https://www.mathworks.com/help/matlab/matlab_prog/types-of-functions.html
Additionally, the function getcurrentdir() probably should have an underscore to match the function call. get_currentdir().
