Question 2: Write a C program for the following functions:

1. intstrlen(char *s); [returns string length]

2. char* strcpy(char *s1, char *s2); [Copies string s2 into string s1. The value of s1 is returned.] 3. char* strcat(char *s1, char *s2); [Appends string s2 to string s1. The first character of s2 overwrites the terminating null character of s1. The value of s1 is returned.]

Use above function in your program to get and print length of a string, copy str1 to str2 and append str2 at the end of str1. Do not use string.h header file in your programme.