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In the context of scanf - When you put a '*' after the %, it will read the input and do nothing with it

i.e.


scanf("%d%*c", &choice);


%d - This would read the first input part as a...

scanf("so you wan to be... %d \n", &choice);


should be more like


puts("so you wan to be...");
scanf("%d%*c", &choice); // (%*c for when the user hits enter)