Fix existing examples so they pass all tests

[0xbarrett]

• Anagram: Fix 1 failing test
• Leap: Fix 1 failing test
• Leap: Fix 2 compiler warnings

[ryanplusplus]

I think the issue with Hello World is that a stub is provided named hello_world.c. When you try to rename example.c to hello_world.c it fails and so runs the tests with the empty implementation and fails all 3 tests. When I tested by removing hello_world.c and example.c all tests pass.

[ryanplusplus]

I don't see any failures for Anagram. What failure are you seeing?

[0xbarrett]

Yep, good call about Hello World. As for Anagram, I'm getting:
anagram.c:163:test_multiple_anagrams:FAIL: Expected 3 Was 0 on OS X with LLVM 8.0.0.
...
However, on Ubuntu 16.04 with GCC 5.4.0, everything passes.

[arcuru]

I can't get a failure for Anagram either (Ubuntu 12.04 & 16.04). I even tried it using GCC 4.8, which I think I heard was the version on Travis (?) but that worked fine as well.

I will take a more in-depth look tomorrow and test the failure on Travis.

We need to get this running before putting more exercises in. #71 wouldn't even compile, one of the test names was wrong.

[0xbarrett]

Ok, I'm not sure what was going on before, but Anagram is now working for me. Maybe fed3ddf fixed it?

[ryanplusplus]

I think it's quite likely that it did. I think this is good to go.