Hi Ram,

Have u tried searching this, from searchbar on top?

I found this articles useful.

1) Program to copy one string s2 to another string s1 without using strcopy function
www.syntax-example.com/.../...-string-s1-2234.aspx

2) Program to compare one string s2 to another string s1. Print the difference of first unmatched characters (Without Using strcmp function) in C Programming
www.syntax-example.com/.../...-string-s1-1462.aspx

There are lots of articles maching your need.