Cast long to varchar Oracle

Question

Is there a way to cast long datatype to varchar on Oracle?

table 1:

table 2:

Errors:

Example of data on table 1 (table 2 is the same but without 'GUID|' and it's a varchar):

Obs.:

• I can not create another table (create as select);
• I've tried use pl/sql to select long into varchar (didn't work);
• to_char doesn't work;
• I have to update lines on table 1 that are in table 2;