C language: please help me figure out the problems in the codes below:

struct LinkedList int data; struct LinkedList* next; l; int main) struct LinkedList *A = NULL; insert(A,3); printList(A); return O; void insert(struct LinkedList *root, int item) root-malloc(sizeof(struct LinkedList); root->data- item; root->next NULL; void printlist(struct LinkedList *head) struct LinkedList *temp-head; while (temp! NULL){ printf("%d", temp- >data); temp = temp->next