View Compilation Error

0_0_38566879_17870.cpp: In function 'void stern(int)':
0_0_38566879_17870.cpp:10:28: error: void value not ignored as it ought to be
   10 |                 {s[x]=stern(s[x]);}
      |                       ~~~~~^~~~~~
0_0_38566879_17870.cpp:11:27: error: return-statement with a value, in function returning 'void' [-fpermissive]
   11 |                 return s[x];}
      |                        ~~~^
0_0_38566879_17870.cpp: In function 'void merge(int, int)':
0_0_38566879_17870.cpp:13:25: error: void value not ignored as it ought to be
   13 |                 {x=stern(x);
      |                    ~~~~~^~~
0_0_38566879_17870.cpp:14:32: error: void value not ignored as it ought to be
   14 |                         y=stern(y);
      |                           ~~~~~^~~
0_0_38566879_17870.cpp: In function 'int main()':
0_0_38566879_17870.cpp:20:14: error: expected primary-expression before ';' token
   20 |         cin>>;
      |              ^