Update api.py

clean: change fixxing way to remove unnecessary back slash.

api.py

@@ -23,7 +23,7 @@ app.mount("/public", StaticFiles(directory="public", html=True), name="public")
 def index() -> FileResponse:
     return FileResponse(path="./view/index.html", media_type="text/html")
 
-@app.post("/prediction/")
+@app.post("/prediction")
 async def predict(targetImage: UploadFile):
   path = f'public/{targetImage.filename}'# api/filesディレクトリを作成しておく
   with open(path, 'wb+') as buffer: