Write/Implement a function definition for a function my_strcpy () 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. Write/Implement a function definition for a function my_strncat () with the following header: char *my_strncat (char *destination, const char *source, int n) This function appends no more than n characters from the string pointed to by source to the end of the string pointed to by destination. The null 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. Write/Implement a function definition for a function my_strcmp () with the following header: int my_strcmp (const char *s1, const char *s2) This function compares the string pointed to by s1 to the string pointed to by s2. If the string pointed to by s1 comes before the string pointed to by s2 in 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 sense). Otherwise 1 is returned