Write a function to reverse part of the passed sound just between the passed start and end index.

In order to reverse part of the passed in sound, and not a copy of the sound, we need to copy out the entirety of the non-reverse section in order to avoid overwriting half of it as we reverse.

```
def reverseBetween(sound, startIndex, endIndex):
soundSamples = getSamples(sound)
target = makeEmptySound(endIndex-startIndex)
targetSamples = getSamples(target)

for index in range(startIndex, endIndex):
sourceValue = getSampleValue(soundSamples[index])
setSampleValue(targetSamples[index-startIndex], sourceValue)

for index in range(startIndex, endIndex):
sourceValue = getSampleValue(targetSamples[index-startIndex])
setSampleValue(soundSamples[endIndex-1-(index-startIndex)], sourceValue)
```