int is_valid_word(char word[], char hand[], int handCount[], char word_list[MAX_WORDS][MAX_LENGTH+1])
/* Returns TRUE if word is in the 'word_list' and is entirely composed of letters in the hand. Otherwise, returns FALSE
   Does not alter 'hand' or 'word_list'.
    word: string
    hand: string
    word_list: list of lowercase strings
*/
{
//implement code here

}