added find, more tests

libkeke_utils.c

@@ -0,0 +1,17 @@
+#include <stddef.h>
+
+void keke_swap(void *a, void *b, size_t size) {
+	char *aa = a;
+	char *bb = b;
+	for(size_t i = 0; i < size; i++) {
+		aa[i] ^= bb[i];
+		bb[i] ^= aa[i];
+		aa[i] ^= bb[i];
+	}
+}
+
+size_t next_power_of_two(size_t s) {
+	size_t t = 1;
+	while(t < s) t <<= 1;
+	return t;
+}