Implement custom round function

Create your own round()-style routine without relying on built-in conversion behavior. Its argument is supplied as text. Accepted inputs may be ordinary decimal values, signed values, or numeric strings large enough that float() would overflow. Input Format input_str: Text that encodes a floating-point value. The accepted syntax is an optional leading + or -, followed by digits with an optional decimal point and digits. A decimal point may appear without digits on one side,…