View Compilation Error

0_0_27050502_20120.cpp: In function 'char* change(char*)':
0_0_27050502_20120.cpp:21:2: error: a function-definition is not allowed here before '{' token
  { char str1[maxn];
  ^
0_0_27050502_20120.cpp:33:9: error: expected '}' at end of input
         }
         ^