v0.0.0-windows

memory leak (#28)

* forgot to free the memory I was allocating with fftw_malloc with fftw_free

* resolved memory leak and fixed thrown exception when closing the window

v0.0.0-ubuntu

memory leak (#28)

* forgot to free the memory I was allocating with fftw_malloc with fftw_free

* resolved memory leak and fixed thrown exception when closing the window