I don't know why you changed the name of the sections in the my.ini file but the wampmysqld and wampmysqld64 should not be named like that. Please remove the data of the wampmysqld section and rename the wampmysqld64 one to mysqld.
I just followed these steps to rename the folder and they worked.
- Stop MySQL
- Edit the datadir and log-error under the mysqld section
# The MySQL server
# set datadir to the location of your data directory
- Copy the content of the current data folder to the new one.
- Start MySQL again
If you continue running into issues, please run the Bitnami support tool again.