fixed project structure & header + implementation files
 On branch master
	renamed:    Aufgabe1/RationalNumber/RationalNumber/RationalNumber.pro -> Aufgabe1/RationalNumber/RationalNumber.pro
	deleted:    Aufgabe1/RationalNumber/RationalNumber/main.c
	deleted:    Aufgabe1/RationalNumber/RationalNumber/rationalnumber.cpp
	deleted:    Aufgabe1/RationalNumber/RationalNumber/rationalnumber.h
	new file:   Aufgabe1/RationalNumber/rationalnumber.cpp
	new file:   Aufgabe1/RationalNumber/rationalnumber.h
	deleted:    HelloC4J/HelloC4J.pro.user