Many programming languages implement a function called $`$sum$()`,$ which returns the sum of an arbitrary sequence of numbers.

Define a function $`$mySum$`$ that allows us to sum up any number of numeric values. For example:

$-$ Calling $`$mySum$(1,12,89,5)`$ returns $`107`.$

$-$ Calling $`$mySum$()`$ with no arguments returns $`0`.$

The built$-$in function $`$sum$()`$ is not allowed to use in the function body. Instead, use a for loop to tally the sum incrementally.