Function duckdb_table_description_get_column_name 

pub unsafe extern "C" fn duckdb_table_description_get_column_name(
    table_description: duckdb_table_description,
    index: idx_t,
) -> *mut c_char

Obtain the column name at ‘index’. The out result must be destroyed with duckdb_free.

@param table_description The table_description to query. @param index The index of the column to query. @return The column name.