init arena

[todo]

Size of arena = MEM_SIZE. To define where would be our players we need

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corewar/vm/src/virtual_machine.c

Lines 42 to 47 in 1498258

	** TODO: init arena
	** BODY: Size of arena = MEM_SIZE. To define where would be our players we need
	** MEM_SIZE davide on number of players.
	*/
	int main(int argc, char **argv)

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This issue was generated by todo based on a TODO comment in 1498258 when #9 was merged. cc @ykliek.