Fixing format of new exam exercices

[Hamzaelkhatri]

fix format of those execices :

solutions/alphaposition.go
solutions/argrotn/main.go
solutions/paramrange/main.go
tests/alphaposition_test/main.go
tests/argrotn_test/main.go
tests/betweenus_test/main.go
tests/binaryaddition_test/main.go
tests/countnegative_test/main.go
tests/divisors_test/main.go
tests/getarea_test/main.go