请教关于动态内存分配问题，如果要用上malloc()函数应该如何做

在动态存储器中确保一个结构体的区域，确保完成后让用户输入结构体的信息。
使用AceStriker的结构体，如果无法确保区域，则printf输出错误消息
确保领域后，让用户输入选手名和得分数，保存到结构体中

问题相关代码，请勿粘贴截图

#include <stdio.h>
typedef struct {
    char name[50];
    int goalno;
} AceStriker;
AceStriker hattrick(AceStriker *);
int main() {
    AceStriker messi = {"Lionel Messi", 5};
    messi = hattrick(&messi);
    printf("%s scores a hattrick! New number of goals: %d.\n", messi.name, messi.goalno);
    return 0;
}
AceStriker hattrick(AceStriker *fw) {
    fw->goalno += 3;
    return *fw;
}

我想要达到的结果

输出结果为:

Fruit data before deleting
Code: 1008, Fruit: Apple, Price: 250
Code: 1005, Fruit: Banana, Price: 160
Code: 1009, Fruit: Kiwi, Price: 98
Code: 1013, Fruit: Grape, Price: 1650
Code: 1007, Fruit: Orange, Price: 180
Code: 1002, Fruit: Pineapple, Price: 298
Code: 1004, Fruit: Kaki, Price: 230
Code: 1010, Fruit: Nashi, Price: 370
Code: 1006, Fruit: Pear, Price: 270
Code: 1001, Fruit: Strawberry, Price: 400
*** Deleting fruit with barcode 1007 ***
Fruit data after deleting
Code: 1008, Fruit: Apple, Price: 250
Code: 1005, Fruit: Banana, Price: 160
Code: 1009, Fruit: Kiwi, Price: 98
Code: 1013, Fruit: Grape, Price: 1650
Code: 1002, Fruit: Pineapple, Price: 298
Code: 1004, Fruit: Kaki, Price: 230
Code: 1010, Fruit: Nashi, Price: 370
Code: 1006, Fruit: Pear, Price: 270
Code: 1001, Fruit: Strawberry, Price: 400

你题目的解答代码如下：

#include<stdio.h>
#include<stdlib.h>
typedef struct {
    char name[50];
    int goalno;
} AceStriker;
AceStriker hattrick(AceStriker *);
int main() {
    AceStriker messi = {"Lionel Messi", 5};
    messi = hattrick(&messi);
    printf("%s scores a hattrick! New number of goals: %d.\n", messi.name, messi.goalno);
    return 0;
}
AceStriker hattrick(AceStriker *fw) {
    fw = (AceStriker *)malloc(sizeof(AceStriker));
    scanf("%s", fw->name);
    scanf("%d", &fw->goalno);
    return *fw;
}

如有帮助，请点击我的回答下方的【采纳该答案】按钮帮忙采纳下，谢谢!

http://www.cplusplus.com/reference/cstdlib/malloc/

/* malloc example: random string generator*/
#include <stdio.h>      /* printf, scanf, NULL */
#include <stdlib.h>     /* malloc, free, rand */

int main ()
{
  int i,n;
  char * buffer;

  printf ("How long do you want the string? ");
  scanf ("%d", &i);

  buffer = (char*) malloc (i+1);
  if (buffer==NULL) exit (1);

  for (n=0; n<i; n++)
    buffer[n]=rand()%26+'a';
  buffer[i]='\0';

  printf ("Random string: %s\n",buffer);
  free (buffer);

  return 0;
}

看一个例子。
malloc(sizeof(AceStriker))
注意 free

#include <stdio.h>
#include <stdlib.h>
typedef struct {
    char name[50];
    int goalno;
} AceStriker;
AceStriker * hattrick(AceStriker*);
int main() {
    AceStriker* messiP = (AceStriker*) malloc(sizeof(AceStriker));
    sprintf(messiP->name, "%s", "Lionel Messi");
    messiP->goalno = 5;
    
    messiP = hattrick(messiP);
    printf("%s scores a hattrick! New number of goals: %d.\n", messiP->name, messiP->goalno);
    free(messiP);
    return 0;
}
AceStriker * hattrick(AceStriker* fw) {
    fw->goalno += 3;
    return fw;
}