9. Basic Debugging

Activity 9.01: Building a Program to Validate Social Security Numbers

Solution:

All directories and files created should be within your $GOPATH:

1. Create a directory called Activity9.01 inside the Chapter09 directory.
2. Create a file called main.go inside the Chapter09/Activity9.01/ directory.
3. Using Visual Studio Code, open the main.go file.
4. Add the following code to main.go.

   Here is the main function to build from:

   package main
   import (
       "errors"
       "fmt"
       "log"
       "strconv"
       "strings"
   )

5. Add the following custom error types. The custom errors that we will be using to log in to our program. These custom errors will be returned by their respective functions. They will appear in the log where applicable:

   var (
       ErrInvalidSSNLength     = errors.New("ssn is not...