Renaming a schema is not an easy thing in Oracle. For reasons unknown Oracle does not allow you to rename a schema by a keyword such as
rename old_schema to new_schema;
alter user old_schema rename to new_schema;
THIS FACILITY DOES NOT EXIST in Oracle. There might be some utilities or some undocumented features which might leverage the renaming a schema.
But if you really want one way to rename the schema go for the traditional way of exporting the existing schema and import into a new schema. Use clause fromuser touser while importing.
But this too is not fully renaming schema as the privileges will not be imported.