main.rb

In the above code, we define a function `triangular_prism_volume` which takes three parameters - `base`, `height`, and `length`. These parameters represent the base width, height, and length of the triangular prism respectively.

Inside the function, we first calculate the area of one of the triangular faces using the formula `0.5 * base * height`. 

Then, we calculate the volume of the prism by multiplying the area of the triangle face with the length of the prism.

Finally, we return the volume value from the function.

We can then call this function with appropriate values to calculate the volume of any triangular prism. In the example above, we call the function with `base = 3`, `height = 4`, and `length = 5` which results in a volume of `30.0`.
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