Renames a lot of files in directory

Hello, I have a lot of .mat files in a folder and I want to rename it from ex : 65300106179 into something like Flight 10001 and so on. Below is my code

f = dir( fullfile( projectdir, '**', '*.mat') );
for kk = 1:numel(f)
  fileFrom = f(kk).name;
  fileTo = ['Flight',erase(f(kk).name,'1000%d.mat'),'.mat'];
  movefile(fileFrom,fileTo);
end

The problem I have is the file name changed into Flight65300106179.mat. Any idea where I did wrong?

Answer 1

[KSSV]

f = dir( fullfile( projectdir, '**', '*.mat') );
for kk = 1:numel(f)
  fileFrom = f(kk).name;
  fileTo = ['Flight','1000%d.mat','.mat'];
  movefile(fileFrom,fileTo);
end

[Oktavian Jason]

the file name become Flight1000%d.mat, and the other files are gone....

Only 1 got changed into that

[KSSV]

f = dir( fullfile( projectdir, '**', '*.mat') );
for kk = 1:numel(f)
  fileFrom = f(kk).name;
  fileTo = ['Flight',num2str(kk),'.mat'];
  movefile(fileFrom,fileTo);
end

[Oktavian Jason]

Ok this works, but from Flight 1 and so on, I need to start from Flight 10001.

[KSSV]

f = dir( fullfile( projectdir, '**', '*.mat') );
for kk = 1:numel(f)
  fileFrom = f(kk).name;
  N = 10000+kk ; 
  fileTo = ['Flight',num2str(N),'.mat'];
  movefile(fileFrom,fileTo);
end

[Oktavian Jason]

thank you

[Oktavian Jason]

Do you have any idea how I can rename on subfolder too?

Example : Folder A : Flight 10001-Flight 10010, Folder B : Flight 10011-Flight 10020

Answer 2

[Bhaskar R]

fileTo = sprintf('Flight 1000%d.mat',kk);