This question is looking for any established terminology, function, transformation or whatever the generalized term is for transmuting one collection of things into the same or different collection of things, whereby the english definition of said process might be, "it removes the decimal point from the number".
As an example, imagine a function that operated on rational numbers that did not have trailing zeroes after the decimal and only had a finite number of digits after the decimal point.
$$f(4) = 4$$ $$f(4.2) = 42$$ $$f(34.10983) = 3410983$$ $$f(-44.34) = -4434$$
Does anything (function or no) like $f$ have a name that already exists?
If a computational example helps, this is how I might define this function in python:
def remove_decimal(num: float) -> int:
float_string = str(num)
assert not('.' in float_string and float_string[-1] == '0') # Makes trailing zeroes after a decimal illegal.
return int(float_string.replace('.', ''))