foo.c: In function 'main':
foo.c:28:21: error: called object 'maxProfit' is not a function or function pointer
   28 |     int maxProfit = maxProfit(n, prices);
      |                     ^~~~~~~~~
foo.c:28:9: note: declared here
   28 |     int maxProfit = maxProfit(n, prices);
      |         ^~~~~~~~~

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