add getBalance, clear input from memory

assembly/dice.ts

@@ -67,6 +67,9 @@ export class GameManager {
     }
 
     getBalance(playerId: u64): Response {
-        return new GetBalanceResponse(1);
+        if (!this.playerBalance.has(playerId)) {
+            return new ErrorResponse("There is no player with id: " + playerId.toString());
+        }
+        return new GetBalanceResponse(this.playerBalance.get(playerId));
     }
 }

assembly/game_handler.ts

@@ -16,10 +16,9 @@ export function handler(requestBytes: Uint8Array): string {
     } else if (request instanceof GetBalanceRequest) {
         return gameManager.getBalance(request.playerId).serialize();
     } else if (request instanceof UnknownRequest) {
-        return new ErrorResponse("").serialize();
+        return new ErrorResponse("There is no such type of request.").serialize();
     } else {
-
-    }
-
+        unreachable();
         return "";
     }
+}

assembly/index.ts

@@ -35,5 +35,7 @@ export function invoke(ptr: i32, size: i32): i32 {
       store<u8>(strAddr + i, b);
     }
 
+    memory.free(ptr);
+
     return addr;
 }