On the second thought memmove was correct

src/string.c

@@ -12,7 +12,6 @@ void *memcpy(void *restrict s1, const void *restrict s2, size_t n) {
 void *memmove(void *s1, const void *s2, size_t n) {
     u8* c1 = s1;
     const u8* c2 = s2;
-    // Note(bumbread): shouldn't this be backwards?
     if (c1 != c2) {
         if (c1 < c2) {
             // reverse copy

test/stuff.c

@@ -0,0 +1,13 @@
+
+#include <string.h>
+#include <stdio.h>
+
+
+
+int main() {
+    char arr[] = "Bruh\0\0\0";
+    printf("Before memmove: %s\n", &arr[0]);
+    memmove(arr+3, arr, 4);
+    printf("After memmove: %s\n", &arr[0]);
+    return 0;
+}