c 给字符串赋值

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

int main(void)
{
    char* aa = "hello world";
    char* bb = (char*)malloc(strlen(aa)+1);
    char* ta = aa;
    char* tb = bb;
    while(*bb++ = *aa++){
        ;
    }
    bb = tb;
    printf("%s\n",bb);
    return 0;
}

console log:
hello world