Changed car_co2_km to car_l_100km because its more important for user and implemented calc_l_consumption

src/main/java/de/hs_mannheim/domain/System.java

@@ -253,8 +253,10 @@ public class System {
         return result;
     }
 
-    public String calc_co2(String destination_zip){
-        return "";
+    public String calc_l_consumption(String destination_zip){
+        
+        return "" + (Double.parseDouble(distance(destination_zip).replace(" km", "")) * (current_user.getCar_l_100km() / 100)) + " l";
+    
     }
 }
 

src/main/java/de/hs_mannheim/domain/User.java

@@ -7,7 +7,7 @@ public class User {
     private String hometown = "";
     private int zip;
     private String car_name = "";
-    private double car_co2_kmh;
+    private double car_l_100km;
     private double car_avg_kmh;
     private double bike_avg_kmh;
 
@@ -51,12 +51,12 @@ public class User {
         this.car_name = car_name;
     }
 
-    public double getCar_co2_kmh() {
-        return car_co2_kmh;
+    public double getCar_l_100km() {
+        return car_l_100km;
     }
 
-    public void setCar_co2_kmh(double car_co2_kmh) {
-        this.car_co2_kmh = car_co2_kmh;
+    public void setCar_l_100km(double car_l_100km) {
+        this.car_l_100km = car_l_100km;
     }
     
     public double getCar_avg_kmh() {