Problem:
Score : 200 points

Problem Statement

A string S of an odd length is said to be a strong palindrome if and only if all of the following conditions are satisfied:

S is a palindrome.

Let N be the length of S. The string formed by the 1-st through ((N-1)/2)-th characters of S is a palindrome.

The string consisting of the (N+3)/2-st through N-th characters of S is a palindrome.

Determine whether S is a strong palindrome.

Constraints

S consists of lowercase English letters.

The length of S is an odd number between 3 and 99 (inclusive).

Input

Input is given from Standard Input in the following format:

S

Output

If S is a strong palindrome, print Yes;
otherwise, print No.

Sample Input 1

akasaka

Sample Output 1

Yes

S is akasaka.

The string formed by the 1-st through the 3-rd characters is aka.

The string formed by the 5-th through the 7-th characters is aka.
All of these are palindromes, so S is a strong palindrome.

Sample Input 2

level

Sample Output 2

No

Sample Input 3

atcoder

Sample Output 3

No

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>
int main(){
	char str[100];
	char str2[100];

	scanf("%s", str);
	
	int len = strlen(str);
	int len2 = (len-1)/2;
	int len3 = (len+3)/2;
	char stri[100];
	char strii[100];
	//separating n-1/2
	for(int i = 0, j = 0; i<=len2-1; i++, j++){
		stri[j] = str[i];
	}
	stri[len2] = '\0';
	//separating n+3/2
	for(int i = len3-1, j = 0; i<len; i++, j++){
		strii[j] = str[i];
	}
	strii[len] = '\0';
	
	
	//mirror whole string
	for(int i = len-1, j = 0; i>=0; i--, j++){
		str2[j] = str[i];
	}
	str2[len] = '\0';
	
	//printf("%d %d", len2, len3);
	char str3[100];
	char str4[100];
	//mirror n-1/2
	for(int i = len2-1, j = 0; i>=0; i--, j++){
		str3[j] = str[i];
	}
	str3[len2] = '\0';
	//mirror n+3/2
	for(int i = len-1, j = 0; i>=len3-1; i--, j++){
		str4[j] = str[i];
	}
	str4[len3] = '\0';
	
	
	if((strcmp(str, str2) == 0) && (strcmp(stri, str3) == 0) && (strcmp(strii, str4) == 0)){
		printf("Yes\n");
	//	int flag1 = 1;
	}else{
		printf("No\n");
		//int flag1 = 2;
	}
	
	
//	printf("%s\n%s\n%s\n%s\n%s", str2, str3, str4, stri, strii);
	
	return 0;
}