Make sure the current version of your script works correctly before
Next, initialize a variable called "sum" to 0, before the "for" loop.
You will use this variable to add each positional variable one-by-one,
so starting it at zero should make sense.
Don't worry about the adding for now, but echo out the value of the variable
"sum" after the loop.
Test your script again, make sure it displays the positional parameters
and the zero at the end.
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