PostgreSQL database does not exist error
The database was created with double quotes, so the name is now case-sensitive and you are now stuck with the dreaded quoted identifiers. "Owino" is a different name than Owino

GRANT ALL PRIVILEGES ON DATABASE "Owino" to OdooD;


Depending on how you created the user, you might need to use the dreaded double quotes for the user name as well ("OdooD"). 

I highly recommend to simply never use double quotes in SQL. 

See the manual for more details:
https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS