#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 size = myStrlen(s);
	int i;
	tmp = (char*)malloc(sizeof(char) *(2*size+1));
	if(tmp == NULL)
	{
		printf("ERROR\n");
		return 0;
	}
	for(i=0; i<size; i++)
	{
		tmp[i] = s[i];
	}
	for(i=0; i<size; i++)
	{
		tmp[i+size] = s[size-i-1];
	}
	tmp[2*size] = '\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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

YWJjZA==

abcd