Code:
/*

 *           *
    *     *
       *
   *      *
*            *

*/

#include <stdio.h>

void displayStar()
{
	int starCount = 0;
	bool invalid = true;
	while(invalid)
	{
		printf("Enter odd number of start you wants in row/column -> "); 
		scanf("%d", &starCount);
		if((starCount % 2 == 0) || (starCount > 100) || (starCount <= 0) ) {
			printf("Please Enter any ODD number in range of 3 to 100\n");
			invalid = true;
			fflush(stdin);
		}
		else{
			invalid = false;
		}
	}

	int innerCount = 0;
	int outerCount = 0;
	for(outerCount = 0; outerCount < starCount; outerCount++)
	{
		for(innerCount = 0; innerCount < starCount; innerCount++)
		{
			if((innerCount == outerCount) || 
			   (innerCount == starCount - outerCount -1)) 
			{
				printf("*");
			}
			else
			{
				printf("  ");
			}
		}
		printf("\n");
	}
}

int main(int argc, char* argv[])
{
	displayStar();
	return 0;
}
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