Universal Postgres CRUD Utility

I need a reusable SQL/PL-pgSQL routine that can handle Create, Read and Update actions against any table in my PostgreSQL database. Table names, column sets and primary keys will be supplied at runtime,... (Budget: ₹1500 - ₹12500 INR, Jobs: Data Integration, Data Modeling, Data Processing, Database Development, Database Management, Database Programming, PostgreSQL, SQL)