In C program. implement list_find( list_t* list, int targetElement ) function /* * dataStructure.h * * Provides a data structure made of a doubly-headed singly-linked list (DHSL) * of unsorted elements (integers) in which duplicated elements are allowed. * * A DHSL list is comprised of a single header and zero or more elements. * The header contains pointers to the first and last elements in the list, * or NULL if the list is empty. The first element contains a pointer to * the next element, and so on. The last element in the list has its * "next" pointer set to NULL. * * The interface of this data structure includes several utility * functions that operate on this data structure. * * Precondition: Functions that operate on such data structure * require a valid pointer to it as their first argument. * * Do not change this dataStructure.h file. * */ /*** Data structure ***/ /* List element (node): our DHSL list is a chain of these nodes. */ typedef struct element { int val; structelement*next; } element_t; /* List header: keeps track of the first and last list elements as well as the number of elements stored in our data structure. */ typedef struct list { element_t* head; element_t* tail; unsignedint elementCount; } list_t; /*** Data structure interface ***/ /* A type for returning status codes */ typedef enum { OK, ERROR, NULL_PARAM } result_t;   //dataStructure.c   /* Description: Returns a pointer to the element (i.e., to the node) that * contains the first occurrence of "targetElement" in the data * structure pointed to by "list". Returns NULL if "targetElement" * is not found. Returns NULL if "list" is NULL. * This function does not modify the data structure. * Time efficiency: O(n) */ element_t* list_find( list_t* list, int targetElement ) { element_t* anElement = NULL; // Stubbing this function // This stub is to be removed when you have successfully implemented this function, i.e., // ***Remove this call to printf!*** printf( "Calling list_find(...): find the first occurrence of targetElement %d in the list.\n", targetElement );   }

C++ Create a generic function add_bookends(ls, e) that adds a copy of element e to the front and back of list ls.

Consider the following function access_element_by_index that returns the iterator to the element at the index i in the list l.   typedef std::list<int> int_list; int_list::iterator access_element_by_index(size_t I, int_list &) {        assert( ? );        … }   Assume the first element of the list is at the index 0, the second at the index 1, and so on. If the function is required to return an iterator that can be dereferenced, determine the precondition of the function, and write an assertion to validate it. (You don’t need to implement the functions).

Write a C code that will search an int type target from a dynamic linked list. The linked list contains int type values inside each of the nodes. The “search” function will use following input-output arguments,Input: Pointer to the head of the list that you are searching Target value that you are searchingOutput: Pointer to the node that contains the target if found or, NULL if not found.