• Appending one string to the end of another string is called string concatenation

Example let STR1= "hello"

STR2= "world"

• If we concatenate STR2 with STR1, then we get the string "helloworld"

1. i= 0, j=0;
2. while   STR1[i] != '\o'
i++;
3. while    STR2[j] != '\o'

   STR1[i]= STR2[j];
   i =i+1
   j = j+1

4. STR1[i]= '\o';
5. Return  STR1;