View Compilation Error

0_0_25902131_13878.cpp: In function 'void myitoa(__int128, char*)':
0_0_25902131_13878.cpp:57:22: error: a function-definition is not allowed here before '{' token
 int num(B &s, int i) {
                      ^
0_0_25902131_13878.cpp:154:1: error: expected '}' at end of input
 }
 ^