foo.c: In function 'main':
foo.c:17:5: warning: implicit declaration of function 'jump' [-Wimplicit-function-declaration]
foo.c: In function 'jump':
foo.c:28:5: error: expected declaration or statement at end of input
foo.c: In function 'main':
foo.c:18:1: warning: control reaches end of non-void function [-Wreturn-type]