• Removal of multiples of 0 was not mentioned in the description.

• Example and sample tests like below should be added

test.assert_equals(quadratic_builder("(x+0)(x+1)"), "x^2+x")
test.assert_equals(quadratic_builder("(2q+3)(2q-3)"), "4q^2-9")

• Description also does not mention that m and p will never be 0, also n and q can be 0

• Description should be language-agnostic (removal of function names)