Fixed some formatting issues

Signed-off-by: Jim Martens <github@2martens.de>

02/src/de/dis2017/data/Contract.java

@@ -1,9 +1,8 @@
 package de.dis2017.data;
+
 /**
  * Contract data class
  */
-import java.util.Date;
-
 public class Contract {
 	private int contractNo = -1;
 	private String date;
@@ -34,6 +33,4 @@ public class Contract {
 	public void setPerson(int person) {
 		this.person = person;
 	}
-	
-	
 }

02/src/de/dis2017/data/PurchaseContract.java

@@ -29,6 +29,4 @@ public class PurchaseContract extends Contract {
 	public void setHouse(int house) {
 		this.house = house;
 	}
-	
-	
 }

02/src/de/dis2017/data/TenancyContract.java

@@ -40,6 +40,4 @@ public class TenancyContract extends Contract {
 	public void setApartment(int apartment) {
 		this.apartment = apartment;
 	}
-	
-	
 }