I want directory structure like this

VEHICLES->CARS

BIKES->

VEHICLES is a main directory CARS is a sub-directory and BIKES is also sub-directory of VEHICLES

we have CARS and BIKES in an array called @files

 $dir= "VEHICLES";
mkdir ($dir);
chdir ($dir);
foreach $file(@files)
{

  mkdir $file;
  chdir $file;
  chdir $dir;
}
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I am not able to create two sub-directory only one sub-directory is creating inside vehicles

EXAMPLE: VEHICLES->CARS. Bike is not creating inside VEHICLES

I tried alot but couldnt able to do that please help me to do that