Unknown error Xcode

I'm attempting at just writing a standard(very standard) application the code( C-programming compiled in Xcode) is error free except for one build error:

ld: duplicate symbol _main in /Users/jasonbillings/Desktop/TestProject/build/TestProject.build/Debug/TestProject.build/Objects-normal/i386/YouWereBornIn.o and /Users/jasonbillings/Desktop/TestProject/build/TestProject.build/Debug/TestProject.build/Objects-normal/i386/main.o

Command /Developer/usr/bin/gcc-4.2 failed with exit code 1

Ive tried everything to get rid of the error I dont know if it's Xcode or me heres the code i wrote its very standard

Code:

---

#include <stdio.h>
int subtract ( int this_year, int your_age );
int main ( )
{
        int this_year ;
        int your_age ;
        char your_name ;
       
        printf( " Welcome player please enter your name " ) ;
        scanf( "%s", &your_name ) ;
        printf( "Welcome your_name now please enter your age" ) ;
        scanf( "%d", &your_age) ;
        printf( "Now please enter the year" ) ;
        scanf( "%d", &this_year ) ;
        printf( "your_name, was born in %d\n", subtract ( this_year, your_age) ) ;
        getchar() ;
}

int subtract ( int this_year, int your_age )

{
return this_year - your_age ;
}

---

If any idea please post:(

A quick Google search of "ld: duplicate symbol _main" turned up the following results:
http://www.google.com/search?q="ld%3A+duplicate+symbol+_main"+xcode

The first result is a Stack Overflow article that may help you out:
iphone - Xcode duplicate symbol _main . - Stack Overflow

You're trying to squeeze a string (aka an array of characters) into a single character.