/in/foo.c: In function 'encrypt':
/in/foo.c:42:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else 
   ^~~~
/in/foo.c:50:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
    strcat(b,s);
    ^~~~~~
/in/foo.c: At top level:
/in/foo.c:55:6: warning: return type of 'main' is not 'int' [-Wmain]
 void main()
      ^~~~