first non-repeating character in a string

nonrep.c

//first non repeating chaarcter in a string

#include <stdio.h>
#include <string.h>

char firstNon(char str[])
{
  int count[256]={0};
  int i;

  for(i=0;i<strlen(str);i++)
	count[str[i]]++;

			for(i=0;i<strlen(str);i++)
			{
				if(count[str[i]]==1)
				return str[i];
			}
}

int main()
{
	char str[]="adbabc";
	char ans=firstNon(str);
	printf("%c ",ans );
return 0;
}