amal11zz:
I am trying to control a relay with an otp password , GSM module is used to transfer the otp. I have some of the code completed, no compiling errors
Instead of attaching your code, try posting it, using [code]code tags[/code].
(Code tags are the <> symbols in the reply window. It's not too late to edit and do that. 
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You're much more likely to get a reply.
(Many of us don't want to mess around downloading people's code and creating a folder etc to view it, then cleaning it up afterwards. Much easier to view in your original post. 
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Edit: By "OTP", do you mean one-time-programmable, or do you have another meaning for this abbreviation?
Edit2: It's also a good idea to include URLs for the source of any non-standard include files/libraries, such as "GSMSim.h" and "Password.h".