Fix utils.is_number for negative numbers

[MasterAffan]

File:
src/utils.py

The current implementation of is_number fails for negative numbers (e.g., is_number("-5") returns False). Please fix it so it correctly identifies negative numbers as valid numbers.

[olangriffin]

Can this be assigned to me please?

[MasterAffan]

Assigned

[MasterAffan]

@olangriffin were you able to solve this issue, if yes please make a pull request