Remove all pointers

From line 20 and 42

Current issues:
Value entered in input_validation_numbers is shown as being entered
in the function, but it is not returned to the main function to be
stored in the variable.
Merge branch 'next' of github.com:4achoo2/gesundheit into next

Conflicts:
	Google-cpp/example_4_greatest_common_divisor.cpp
Fix merge errors.