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_strncmp.c b/src/ft_strncmp.c
new file mode 100644
index 0000000..2fa1099
--- /dev/null
+++ b/src/ft_strncmp.c
@@ -0,0 +1,16 @@
+#include "libft.h"
+
+int
+ft_strncmp (const char *s1, const char *s2, size_t n)
+{
+  while (n--)
+    {
+      if ((unsigned char)*s1 != (unsigned char)*s2)
+        return ((unsigned char)*s1 - (unsigned char)*s2);
+      if (*s1 == '\0')
+        return (0);
+      s1++;
+      s2++;
+    }
+  return (0);
+}