Fixed overlapping push in ev_str

ev_str.h

@@ -476,6 +476,15 @@ evstring_push_impl(
     evstr_asserttype(*s);
     struct evstr_meta_t *meta = META(*s);
 
+    // Overlapping ranges, need to copy `data` to keep it alive after growing
+    if(*s < data + sz && data < *s + meta->length)
+    {
+      char *old_data = data;
+      data = ev_str_malloc(sz);
+      if(data == NULL) return EV_STR_ERR_OOM;
+      memcpy(data, old_data, sz);
+    }
+
     // TODO Find a more efficient approach?
     u64 required_capacity = meta->length + sz + 1;
     while(required_capacity > meta->capacity) { // `<=` because of the null terminator