find the volume of a triangular prism in rust

main.rs
let volume = calculate_volume(base, height, length);

println!("The volume of the triangular prism is {}", volume);
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main.rs

Explanation of the code:
- The function `calculate_volume` takes in the base, height, and length of the prism as parameters.
- It uses the formula for the area of a triangle to calculate the area of the base (`area = 0.5 * base * height`).
- It then multiplies the base area by the length to get the total volume of the prism (`volume = area * length`).
- The `main` function uses the `calculate_volume` function to find the volume of a triangular prism with base 5, height 3, and length 7.
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