MatlabHelp Move the bins in matrix and get straight line

Hello Dear Friends,
Would you be so kind as to help me with the simple problem in my 
Matlab-Code? I guess, the solution is simple, but I cannot find it.
I need to correct the Range Migration of the left Picture and get a 
straight line. I am trying to move each bin in Fast-time, but the result 
(right picture) side is wrong. (rows in matlab code: 99-111).
P.S. Run the “Korrektur_Synthetic_Apertur_Radar_Stripmap.m” to get the 
results.
Thank you )))