Decision tree for a decision analysis to identify a strategy to reach a goal (clear cut rules and not the ML decision tree)

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I want to develop a script for a decision tree, which I already know its structure, like a flowchart in which each internal node represents a "test" on an attribute (e.g. whether a coin flip comes up heads or tails), each branch represents the outcome of the test, and each leaf node represents a class label. The paths from the root to leaf represent classification rules. Something like this simple decision flow diagram: https://miro.medium.com/max/1258/1*xLKdaL_RFhqFuy1iKSXvXA.png