Goal: Learn to swap string variables.

Assignment: As part of the backend team of a streaming service, you are developing a new encoding to make audio

streaming easier. The audio signals are converted to strings, the first character of which is a checksum for the signal. Severa

white spaces are added to the string at the end to have a consistent number of characters each string carries.

Assume a string variable signal has already been declared and initialized. Write a code snippet that reads the first non$-$

whitespace character of signal. Assign this character to the char variable firstchar, already declared. If signal is empty,

firstchar will be assigned $\frac{\frac{?}{?}}{0}.$