Improve and refine input_validation_numbers function

Remove some of the debugging code from the function, add comments on the main blocks of the function. Add extra variable to allow the raw_user_input to be assigned to user_input and for user_input to then be returned to the main function.
Update goal/line item #2 to done.
Fix indents in input_validation_numbers
Initial version of do/while loop for multiple guesses.
Rename to example_4_decomposition.cpp
Rename to example_2_get_input.cpp
Rename to example_1_hello.cpp
Inital implementation

Not decided if this is the best route, or if I should create a function to offload some of the work.
Add missing equals in line 81, add parensethesis in line 81.
Remove debugging code at end of program.
Add missing #include
Initial commit
Update astyle_preferences
Move astyle_preferences into main folder, update file permissions.
Refactor Google-cpp code with astyle preferences.
Comment out part of astyle_preferences
Correct find_gcd and main function to require/process two ints.
Add missing semi-colons in ln 20/21

Current issues:
1. Lines 30/31 are throwing compile errors. "invalid conversion from ‘int (*)(int)’ to ‘int’ [-fpermissive"
Modify line 20 to remove variable reference in function prototype.
Fix errors to allow for compile, still very much WIP

Fix any gcf entries to reflect correct gcd
Add variables in find_gcd function
Add pointer in input_validation_numbers