llamas | dataframe in Rust , inspired by pandas | Analytics library

I am self learner, I am working on a population growth problem, and I came across the issue of loop running infinitely when I enter a big ending number that I want to reach.

Details of my goal : Say we have a population of n llamas. Each year, n / 3 new llamas are born, and n / 4 llamas pass away.

For example, if we were to start with n = 1200 llamas, then in the first year, 1200 / 3 = 400 new llamas would be born and 1200 / 4 = 300 llamas would pass away. At the end of that year, we would have 1200 + 400 - 300 = 1300 llamas.

I have come to a conclusion that, every 1200 / 3 and 1200 / 4 one year passes and now I am trying to use a for loop to iterate a variable that every time the calculation is done, it iterates + 1 meaning it counts as one year has passed, and then later prints out the amount of years that passed.

Expected results:
./population
Start size: 100
End size: 1000000
Years: 115

This is what I have tried so far. I believe everything is right in this code except the for loop, I cannot get the logic of how a calculation should be done and then later printed out. I always end up with a zero for year.

Here is the code:

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