/in/foo.c:4:29: error: expected ';', ',' or ')' before '*' token
 void en(char c,int n,char *s*/)
                             ^
/in/foo.c: In function 'encrypt':
/in/foo.c:26:12: warning: implicit declaration of function 'en' [-Wimplicit-function-declaration]
            en(a[i]+5,8,s);
            ^~
/in/foo.c: At top level:
/in/foo.c:33:6: warning: return type of 'main' is not 'int' [-Wmain]
 void main()
      ^~~~