View Compilation Error

0_0_36382168_9694.cpp: In function 'int gcd(int, int)':
0_0_36382168_9694.cpp:30:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_36382168_9694.cpp:80:1: error: expected '}' at end of input
 }
 ^