Calendar_api
functions:
    -CRUD User
    -CRUD Event
    -Find user's event by datetime range
    -Find nearest free time slot, by users and min time duration in minutes
    -Exception handing
    -DTO entities

Tech:
Spring-boot, java 17, maven, Spring data (jpa, hibernate), swagger,

Sql queries 
    src/main/resources/sql.sql

Postman config
    src/main/resources/calendar.local.postman_collection.json