I am looking for a help for a stray cat in Salou.

Hello. I was on my vacation in Salou. I met a stray and very skinny cat which is living under the stones in front of the Bar Restaurant La Trinca 2   Carrer de Colon,23,43840,Salou, Tarragona. I fed this skinny cat for 5 days but I had to go back home🥺 If anybody could help this poor cat,if anybody could help Her/Him to get to the vet please. This cat is malnourished and needs help. I want to contribute some money towards his/her treatment .😿🫶I am hopeless with all the messages I have already sent to other places. Can’t  stop thinking of this poor cat. Would you please help me to find the right organisation that I could contact with. Kind Regards. Jolanta