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char message[50]={0};
char str[]=", better life!";
strcpy(message,str);
sprintf(message,"Better city%s",message);
//puts(strcat(message,"Better city"));
char message[50]=", better life!";
sprintf(message,"Better city%s",message);
//puts(strcat(message,"Better city"));
char message[50]={0};
char str[]=", better life!";
sprintf(message,"Better city%s",str);
char * pre, *post, *mid, *result;
strcat(pre, mid);
strcat(pre, post);
strcpy(result, pre);
// 不要越界