/in/foo.c: In function 'main':
/in/foo.c:7:5: warning: implicit declaration of function 'hanio'; did you mean 'hanoi'? [-Wimplicit-function-declaration]
     hanio(3,'A','B','C');
     ^~~~~
     hanoi
/in/foo.c: In function 'hanoi':
/in/foo.c:19:15: error: 'target' undeclared (first use in this function); did you mean 'targrt'?
   move(source,target);
               ^~~~~~
               targrt
/in/foo.c:19:15: note: each undeclared identifier is reported only once for each function it appears in