please solve the three questions to be rating .

thank you

1. (5 pts) Write/Implement a function definition for a function my_strcpy 0 with the following header: char my strcpy (char "destination, const char source) This function copies all characters in the string pointed to by source into the array pointed to by destination. The null character is also copied. The function returns destination. 2. (5 pts) Write/Implement a function definition for a function my_strncat () with the following header: char mystrncat (char destination, const chrrce, int n) This function appends no more than n characters from the string pointed to by character is appended to the end of the result. If the length of the C string in source is less than n, then only the content up to the terminating null character is copied. The destination pointer is returned 3. (5 pts) Write/Implement a function definition for a function my_strcmp() with the following header: int my_stromp (const char *1, const char 2) This function compares the string pointed to by s1 to the string pointed to by dictionary ordering, then -1 is returned. If the string pointed to by s1 is the same as the string pointed to by s2, then 0 is returned (the compare function is case sensitive). Otherwise, 1 is returned. For this problem, you must use pointer arithmetic only, please do NOT use array notation