#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){
    int i;
    for(i=0;s[i]!='\0';i++);
    return i;
}
 
// 関数の中でtmpに対してmallocして
// そこに回文を代入してreturnで返しましょう
char *setPalindrome(char s[]){
	char *tmp;
	//以下に必要な宣言を含めて書いてください
 
    int len = myStrlen(s);
	int i;
 
	// 元の長さ×2 + 終端文字('\0')の1バイト分を確保
	tmp = (char *)malloc(sizeof(char) * (len * 2 + 1));
	if (tmp == NULL) {
		return NULL;
	}
 
 
	for (i = 0; i < len; i++) {
		tmp[i] = s[i];
	}
 
 
	for (i = 0; i < len; i++) {
		tmp[len + i] = s[len - 1 - i];
	}
 
 
	tmp[len * 2] = '\0';
 
	return tmp;
}
 
 
//メイン関数はいじる必要はありません
int main(){
    int i;
    char nyuryoku[1024]; //入力
    char *kaibun;   //回文を受け取る
    scanf("%s",nyuryoku);
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n",nyuryoku,kaibun);
    free(kaibun);
    return 0;
}
 

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hello