Problem Statement

Define and implement a function digit$\_$sum that takes a single number

parameter $($integer or float$)$ and returns the sum of the digits of the number.

If the number is negative, make the digit immediately following the negative

sign negative $($keep the rest of the digits in the number positive$).$ Ignore

periods representing decimal points.

NOTE: In this problem, only provide the function $($similar to Studio

problem $1).$

HINT: To look at individual digits of the input number you will

probably want to turn it into a string and loop over its characters.