View Compilation Error

0_0_21887279_9000.cpp: In function 'long long int power(long long int)':
0_0_21887279_9000.cpp:24:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_21887279_9000.cpp:72:1: error: expected '}' at end of input
 }
 ^