I understand that you are facing an error " Function definitions in a script must appear at the end of the file."
If you are going to have a function in the same file as a script, the function definition must go at the bottom of the file.
You cannot use the structure
some script
function
some more script
It need to be like this
some script
some more script
function
The %% sections are not treated separately: the restrictions apply to the entire file, that if you have a mix of function and script then the function must go at the bottom.
