Description: We want to generate a function that computes the series starting from 0 and ending until the given number. Example: Input: > 6 Output: 0+1+2+3+4+5+6 = 21 Input: > -15 Output: -15 0 Output: 0=0 Solution: 1. If n is 0, "0=0" is returned. 2. If n is negative, "n