Restructure project layout and clean up test suite

Move sources to src/, header to inc/, and tests to tests/src/.
Update Makefiles and .gitignore for the new layout.

Refactor test harness: add crash-wrapper macros (_S_CRASH,
_S_CRASH_I, _S_CRASH_V, _S_CRASH_BUF) replacing 58 hand-written
wrappers, add shared _s_test_int_range helper eliminating duplicate
_s_test_func, add _S_RAND_ITERS constant, move srand() to main()
in all test binaries, and add Doxygen comments to test_utils.h.

1 files changed, 0 insertions, 7 deletions

diff --git a/ft_isprint.c b/ft_isprint.c
deleted file mode 100644
index 73964ff..0000000
--- a/ft_isprint.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include "libft.h"
-
-int
-ft_isprint (int c)
-{
-  return (c >= 32 && c <= 126);
-}