Hi, i am having trouble getting a method relating to a linked list working, i get the errors: assignment makes pointer from integer without a cast and passing argument 1 of âstrcpyâ makes pointer from integer without a cast. i have tried to include all the relevant code, but let me know if you need more info. thanks.

    struct unit
 {
  char code[5];
  char *name;
  node_ptr students;
 };

    typedef struct node *node_ptr;
    struct node
    {
        int student_id;
    char *studentname;
        node_ptr next;
    };

        void enrol_student(struct unit u[], int n)
    {
     int i, p;
     int student_id = 0;
     char code_to_enrol[7];
     char buffer[100];
     node_ptr studentslist;

     scanf("%s\n", code_to_enrol);


     for(i=0; i <= n; i++)
     { 
      studentslist = u[i].students;
      if(strcmp(u[i].code ,code_to_enrol)<=0)
      {

       scanf("enter student details %d %s\n", &studentID, buffer);
       p = (char *) malloc (strlen(buffer)+1);
       strcpy(p, buffer);

       insert_in_order(student_id, buffer, studentslist);
      }
     }
    }

    void insert_in_order(int n, char *i, node_ptr list)
{
    node_ptr before = list;
    node_ptr students = (node_ptr) malloc(sizeof(struct node));
 students->ID = n;
 students->name = *i;


    while(before->next && (before->next->ID < n))
    {
        before = before->next;
    }

    students->next = before->next;
    before->next = students;
}