insert tmp into the share list, just after mpnt

I assume you are referring to the task of inserting a node `tmp` into a linked list after a given node `mpnt`. Here is some sample code in C that demonstrates how to achieve this:

// Define a structure for the linked list node
struct Node {
    int data;
    struct Node* next;
};

// Function to insert a new node after a given node
void insertAfter(struct Node* mpnt, struct Node* tmp) {
    // Make sure mpnt and tmp are not NULL
    if (mpnt == NULL || tmp == NULL) {
        return;
    }
    
    // Update the next pointer of tmp to point to the next node of mpnt
    tmp->next = mpnt->next;
    
    // Update the next pointer of mpnt to point to tmp
    mpnt->next = tmp;
}

To use this `insertAfter` function, you can create new nodes for `mpnt` and `tmp` and call the function with them as arguments. For example:

// Create a linked list with two nodes
struct Node* head = malloc(sizeof(struct Node));
head->data = 1;
head->next = malloc(sizeof(struct Node));
head->next->data = 2;
head->next->next = NULL;

// Create a new node to insert after mpnt
struct Node* tmp = malloc(sizeof(struct Node));
tmp->data = 3;
tmp->next = NULL;

// Call insertAfter to insert tmp after mpnt
insertAfter(head, tmp);

After running this code, the linked list will have three nodes with data values of 1, 2, and 3, in that order.