fixxed missing imports and commented out a non-implemented function call

ref #11

src/models/DistanceDonation.ts

@@ -33,7 +33,7 @@ export class DistanceDonation extends Donation {
   public get amount(): number {
     let calculatedAmount = -1;
     try {
-      calculatedAmount = this.amountPerDistance * this.runner.getDistance();
+      //calculatedAmount = this.amountPerDistance * this.runner.getDistance();
     } catch (error) {
       throw error;
     }

src/models/RunnerGroup.ts

@@ -5,6 +5,7 @@ import {
   IsOptional,
   IsString,
 } from "class-validator";
+import { GroupContact } from "./GroupContact";
 
 /**
  * Defines the runnerGroup interface.

src/models/Scan.ts

@@ -5,6 +5,7 @@ import {
   IsOptional,
   IsPositive,
 } from "class-validator";
+import { Runner } from "./Runner";
 
 /**
  * Defines the scan interface.