please answer in c language

15 points A valid password must contain at least one lowercase letter, one uppercase letter, and at least one non-letter character. Write a function named "is_valid" that takes in a string and returns 1 if it stores a valid password and 0 otherwise. Recall that the ASCII values of the lowercase letters are contiguous, in order by letter, as are the ASCII values of uppercase letters and that standard inequality operators can be used to compare characters. 1 Add file