Function read_step 

pub fn read_step(
    input: &str,
    topo: &mut Topology,
) -> Result<Vec<SolidId>, IoError>

Read a STEP file and reconstruct topology.

Returns the list of solid IDs created in the topology.

Errors

Returns IoError if:

• The file is not valid STEP Part 21
• Required entities are missing or malformed
• Entity references cannot be resolved