#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]) {
    int i;
    for(i = 0; s[i] != '\0'; i++);
    return i;
}
 
char *setPalindrome(char s[]) {
    int len = myStrlen(s);
    char *tmp = (char *)malloc(2 * len + 1);
    if(tmp == NULL) {
        printf("メモリの確保に失敗しました\n");
        exit(1);
    }
 
    for(int i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    for(int i = 0; i < len; i++) {
        tmp[len + i] = s[len - 1 - i];
    }
 
    tmp[2 * len] = '\0';
 
    return tmp;
}
 
int main() {
    char nyuryoku[1024]; 
    char *kaibun;        
    scanf("%s", nyuryoku);
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
    free(kaibun);
    return 0;
}

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

YWJhYg==

abab