OOD https://github.com/Amitha353/Low-Level-Design https://github.com/tssovi/grokking-the-object-oriented-design-interview/blob/master/object-oriented-design-case-studies/design-an-atm.md https://github.com/tssovi/grokking-the-object-oriented-design-interview/blob/master/object-oriented-design-case-studies/design-an-atm.md https://www.educative.io/courses/grokking-the-object-oriented-design-interview/RMlM3NgjAyR https://leetcode.com/discuss/interview-question/609070/Amazon-OOD-Design-Unix-File-Search-API/529238