$6)$ HW$\_$spectrum $($ImagePtr I$1,$ ImagePtr mag, ImagePtr phase$)$

Implement the $2-$D fast Fourier transform. Use a separable implementation that first calls fft$1$D upon all the rows,

and then takes that result and computes fft$1$D on all the columns. The input image in file in consists of pixels of

type unsigned char. Be sure to append an imaginary channel of $0$s to convert the input into a complex image. Convert the magnitude and phase spectrums into the range $[0,255]$ for display purposes by scaling their maximum and

minimum values to the $[0,255]$ range. Save the scaled results in images mag and phase, respectively

Need in C$++$