modify base method name

lib/integer/base/singleton_class.rb

@@ -26,14 +26,16 @@ def parse(str, chars)
     # @param [#to_int] num
     # @param [Array<#to_sym>] chars
     # @return [String]
-    def convert_to_string(num, chars)
+    def string_for(num, chars)
       case chars.length
       when 1
         convert_to_string_unary num, chars.first
       else
         convert_to_string_positional num, chars
       end
     end
+
+    alias_method :convert_to_string, :string_for
 
     private
 
@@ -118,7 +120,7 @@ def parse_unary_abs(str, char)
     end
 
     # @return [String]
-    def convert_to_string_positional(num, chars)
+    def string_positional_for(num, chars)
       chars = base_chars_for chars
       int   = num.to_int
       base  = chars.length
@@ -136,16 +138,20 @@ def convert_to_string_positional(num, chars)
         s.insert 0, '-' if int < 0
       }
     end
+
+    alias_method :convert_to_string_positional, :string_positional_for
 
     # @return [String]
-    def convert_to_string_unary(num, char)
+    def string_unary_for(num, char)
       char = unary_char_for char
       int = num.to_int
 
       (char.to_s * int.abs).tap {|s|
         s.insert 0, '-' if int < 0
       }
     end
+
+    alias_method :convert_to_string_unary, :string_unary_for
 
   end