Copying a file with specified extension to another folder

I am writing an m-script to copy file from a source folder in C: drive (C:\matlab\) to the destination folder in D:drive(D:\matlab)

the paths mentioned are just for example and not the actual paths.

to get the location of the source and destination folder i am using asking user for input

My source folder is in C: drive and having couple of files like .txt , .mdl , .m etc.

I want to copy all the .mdl files in the source folder to my destination folder in D: drive

basepath = input('Enter base path','s');

targetpath = input('Enter target path','s');

filename = dir(*.mdl)

now with different trial with copyfile command seem to be not working for me

I allready fooled around with copyfile command , but couldn't get it to work,

request you to please provide a solution