[ADD/WIP] Start making string splitters

I want to go on an encore of XEP-0393, with _rectangles_ as boundaries,
this time.

src/StrSplit.c

@@ -0,0 +1,65 @@
+#include <StringSplit.h>
+
+#include <Cytoplasm/Memory.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+char **
+StrSplitLines(char *text)
+{
+    char **ret = NULL;
+    size_t lines = 0;
+
+    char *next = text, *ptr = text;
+    bool done = false;
+    if (!text)
+    {
+        return NULL;
+    }
+
+    while (!done)
+    {
+        size_t bytes;
+        char *line;
+
+        next = strchr(ptr, '\n');
+        if (!next)
+        {
+            next = text + strlen(text);
+            done = true;
+        }
+
+        /* Take the chunk from ptr to [text] */
+        bytes = next - ptr;
+        line = Malloc(bytes + 1);
+        memcpy(line, ptr, bytes);
+        line[bytes] = '\0';
+
+        ret = Realloc(ret, sizeof(char *) * ++lines);
+        ret[lines - 1] = line;
+
+        ptr = *next ? next + 1 : next;
+    }
+
+    ret = Realloc(ret, sizeof(char *) * ++lines);
+    ret[lines - 1] = NULL;
+    return ret;
+}
+void
+StrFreeLines(char **split)
+{
+    char *line, **orig;
+    if (!split)
+    {
+        return;
+    }
+
+    orig = split;
+    while ((line = *split++))
+    {
+        Free(line);
+    }
+
+    Free(orig);
+}