message: Fixed inadequate memory allocation in create_empty function
diff: @@ -1139,7 +1139,7 @@ mod tests {
  let source_data = vec![0x22; api.canonical_length()];
  let source_ptr = write_data(&env, &source_data);
  - let dest_ptr = create_empty(&mut instance, 50);
  + let dest_ptr = create_empty(&mut instance, 70);
  leave_default_data(&env);
  @@ -1154,7 +1154,7 @@ mod tests {
  let (env, mut instance) = make_instance(api);
  let source_ptr = write_data(&env, b"foo"); // too short
  - let dest_ptr = create_empty(&mut instance, 50);
  + let dest_ptr = create_empty(&mut instance, 70);
  leave_default_data(&env);
  @@ -1170,7 +1170,7 @@ mod tests {
  let (env, mut instance) = make_instance(api);
  let source_ptr = write_data(&env, b"foo\0\0\0\0\0");
  - let dest_ptr = create_empty(&mut instance, 50);
  + let dest_ptr = create_empty(&mut instance, 70);
  leave_default_data(&env);
  @@ -1190,7 +1190,7 @@ mod tests {
  let (env, mut instance) = make_instance(api);
  let source_ptr = write_data(&env, &[61; 33]);
  - let dest_ptr = create_empty(&mut instance, 50);
  + let dest_ptr = create_empty(&mut instance, 70);
  leave_default_data(&env);
  