C语言，将指针字符变量A中的某个字符添加到指针字符变量b中

Question

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int url_alsisary(char* url);

int main() {
    char* a = "abcde";
    char* b[10] = {"1"};
    printf("%c\n", (char)a[1]);
    strcat(b, a[1]);
    printf("%s\n", b);
    return 0;
}

只要师傅们们能实现功能就行，我就学习学习

Answer 1

 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int url_alsisary(char* url);
int main() {
    char* a = "abcde";
    char  b[10] = {'1',0};
    printf("%s\n", a);
    strcat(b, a);
    printf("%s\n", b);
    return 0;
}