Fix: Issue TheAlgorithms#9588

Author: haxkd

maths/base_neg2_conversion.py

@@ -1,5 +1,5 @@
 import doctest
-def decimal_to_negative_base_2(n):
+def decimal_to_negative_base_2(n: int) -> int:
     """
     This function returns the number negative base 2 
     of the decimal number of the input data.
@@ -34,6 +34,5 @@ def decimal_to_negative_base_2(n):
 
     return int(ans)
 
-
 if __name__ == "__main__":
     doctest.testmod()