This test case had an error:
test_FindFunction_WhichIsBroken_ShouldReturnZeroIfItemIsNotInList_WhichWorksEvenInOurBrokenCode
It was supposed to be a list of values that are NOT in the list,
and none of them should be found.  It incorrectly included '1'
which is a value in the list.

The compile option -Wno-misleading-indentation was also added to
remove a compiler warning produced by gcc 7.3.0

Delete clang flags that were disabled with -Wno-*

Primarily -
* Added "static" to static functions.
* Added proper signature with "void" to functions without arguments.
* Marked unused arguments with "(void)".
* Removed entirely unused static functions.
* Added "const" to preserve const-correctness.
* Added function prototypes for external functions.

 *  Simple makefile example, extracted from existing example