Revert "factorial feature implementation"

This reverts commit cdee13e690.

DIRECTORY.md

@@ -53,7 +53,6 @@
   * [Ceil](https://github.com/TheAlgorithms/Ruby/blob/master/maths/ceil.rb)
   * [Ceil Test](https://github.com/TheAlgorithms/Ruby/blob/master/maths/ceil_test.rb)
   * [Decimal To Binary](https://github.com/TheAlgorithms/Ruby/blob/master/maths/decimal_to_binary.rb)
-  * [Factorial](https://github.com/TheAlgorithms/Ruby/blob/master/maths/factorial.rb)
   * [Fibonacci](https://github.com/TheAlgorithms/Ruby/blob/master/maths/fibonacci.rb)
   * [Find Max](https://github.com/TheAlgorithms/Ruby/blob/master/maths/find_max.rb)
   * [Find Min](https://github.com/TheAlgorithms/Ruby/blob/master/maths/find_min.rb)

maths/factorial.rb

@@ -1,39 +0,0 @@
-# A ruby program to find factorial of a given integer
-# Factorial of a given integer is defined as the product of all the positive integers less than or equal to the given integer
-# Mathematical representation: n! = n * (n - 1) * (n - 2) * ... * 1
-
-def factorial(number)
-  input = number
-  factorial = 1
-  if number < 0
-    "Please check your input number! The given number is a negative number."
-  else
-    while number > 0
-      factorial *= number
-      number -= 1
-    end
-    "The factorial of #{input} is #{factorial}."
-  end
-  rescue
-    "Error: Please provide integer only!"
-end
-
-# Valid inputs
-puts factorial(0)
-# The factorial of 0 is 1.
-
-puts factorial(10)
-# The factorial of 10 is 3628800.
-
-puts factorial(1)
-# The factorial of 1 is 1.
-
-puts factorial(-5)
-# Please check your input number! The given number is a negative number.
-
-# Invalid inputs
-puts factorial("a")
-# Error: Please provide integer only!
-
-puts factorial("2")
-# Error: Please provide integer only!