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, 16 insertions, 0 deletions

diff --git a/src/ft_strdup.c b/src/ft_strdup.c
new file mode 100644
index 0000000..3a6be31
--- /dev/null
+++ b/src/ft_strdup.c
@@ -0,0 +1,16 @@
+#include "libft.h"
+#include <stdlib.h>
+
+char *
+ft_strdup (const char *s)
+{
+  size_t len;
+  char *dup;
+
+  len = ft_strlen (s);
+  dup = malloc (len + 1);
+  if (!dup)
+    return (NULL);
+  ft_memcpy (dup, s, len + 1);
+  return (dup);
+}