RK0GjB - Online C Compiler & Debugging Tool

#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);
    int i;

    char *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;
}

int main(){
    int i;
    char nyuryoku[1024];
    char *kaibun;

    if (scanf("%s", nyuryoku) != 1) return 1;

    kaibun = setPalindrome(nyuryoku);

    if (kaibun != NULL) {
        printf("%s -> %s\n", nyuryoku, kaibun);
        free(kaibun);
    }

    return 0;
}