run a for loop from the length of the string you want to insert into to the length of the string you want to insert into + the string you want to insert
for each iteration copy the element from string 2 to string 1
come back with your code, if you didnt succed, we cannot just give you the program
I came up with this.... String 2 is perfectly copying in string 1 in any position of string 1. But if i add it at the last, it doesn't works perfectly...