Deallocate the memory of wall_distance variable, wall_x, wall_y, and wall_z
subroutine destroy_wall_dist()
!< Deallocate the memory of wall_distance variable,
!< wall_x, wall_y, and wall_z
implicit none
call dmsg(1, 'wall_dist', 'destroy_wall_dist')
call dealloc(wall_x)
call dealloc(wall_y)
call dealloc(wall_z)
call dealloc(dist)
end subroutine destroy_wall_dist