but ive Heard that our wazu gets makrooh if we stop the passing gas so is our prayers accepted or i should let the gas pass and do wazu again or its not mandatory to do it this way?

But it is not Batil your namaz is correct but if one feel that gas is about to pass while starting his prayer not yet started then absolutely he has to break the wudhu and has to perform the suzy again so he can concentrate in his prayer
While he is already in prayer then he may continue the prayer if possible if not yes then do the same as mentioned above.