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#include <stdio.h>
#include<stdlib.h>

void rev(char *s)
{
	int i, l = strlen(s);
	char t;
	for(i = 0; i < l/2; i++)
	{		
		t = s[i];
		s[i] = s[l - i -1];
		s[l - i - 1] = t;
	}
}
main()
{
	char *s = "hello";
	rev(s);
	printf("%s", s);
		
}