i kinda need to select all the extrudes and extrude them again,

before he uses the tool : https://imageshack.us/f/718/help1d.jpg/

here is the menu where he choose extrude face history again: https://imageshack.us/f/571/helpo.jpg/

and after he pressed it the model looks like this : https://imageshack.us/f/838/help2a.jpg/