function in C++

Question 1 A) Record a simple mono (i.e., one channel) speech message with your voice and save it as an uncompressed WAV RIFF file using any sound editor software, e.g., the open source Audacity2. B) Write a function Mono2stereo that takes your digital speech wav file as input. This function writes out a new WAV file that is stereo, i.e., has two channels. You should be able to listen to the new output file on standard media players. [1 pt] C) Write a function stretch that takes your digital speech wav file and a stretch factor. This function writes a new WAV file that is a sped up or slowed down version of the input WAV by the input stretch factor. You should be able to listen to the new output file on standard media players. [1 pt]