Write a procedure str_ncpy to mimic the strncpy function provided by the C library. The function str_ncpy receives two strings, string1 and string2, and a positive integer num via the stack. Of...

Write a procedure str_ncpy to mimic the strncpy function provided by the C library. The function str_ncpy receives two strings, string1 and string2, and a

positive integer num via the stack. Of course, the procedure receives only the string

pointers, not the actual strings. It should copy at most the first num characters of

string2 to string1.