#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[]){
	//以下に必要な宣言を含めて書いてください
	int mogi = myStrlen(s);           
    int kai = mogi * 2;                
    char *tmp = (char *)malloc(kai+1);
    for(int i=0; i<mogi; i++){
        tmp[i] = s[i];
    }
    for(int i=0; i<mogi; i++){
        tmp[mogi+i] = s[mogi-1-i];
    }
    tmp[kai] = '\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