3. Write a program to copy one string into another string using library function.4. Write a program to copy one string into another string without using library function.5. Write a program to concatenate two strings using library function.
‘C Programming Lecture Notes6. Write a program to concatenate two strings with out using library function.7. Write a program to reverse the contents of a string using library function8. Write a program to reverse the contents of a string without using library functionmain(){char str[20],temp;VVSV111