make the multiply function strict with floats

[thayashi-01]

contributor-onboarding/src/utils.py

Line 20 in 1d943fe

def multiply(a, b) -> float:

def multiply(a, b) -> float:
'''
This function returns the product of two numbers

Args:
a: float the first number
b: float the second number

Returns:
float
'''
return a * b

Expected behavior: Returns the float product of two numbers.
Actual behavior: Accepts non-floats and may return unexpected types.