Refactor Ast.space_separated?.

- Removed unused  `Ast.new_line?` and `Ast#new_line?` methods.

src/ast.cr

@@ -21,27 +21,12 @@ module Mint
                    @nodes = [] of Node)
     end
 
-    def main : Component?
-      @components.find(&.name.value.==("Main"))
-    end
-
-    # TODO: Use line / column instead of offset
     def self.space_separated?(node1, node2)
-      node1.file.contents[node1.to.offset, node2.from.offset - node1.to.offset].count('\n') > 1
-    end
-
-    def self.new_line?(node1, node2)
-      node1.file.contents[node1.from.offset, node2.from.offset - node1.from.offset].includes?('\n')
+      (node2.from.line - node1.to.line) > 1
     end
 
-    def new_line?(node1, node2)
-      start_position =
-        node1.from.offset
-
-      count =
-        node2.to.offset - node1.from.offset
-
-      node1.file.contents[start_position, count].includes?('\n')
+    def main : Component?
+      @components.find(&.name.value.==("Main"))
     end
 
     def merge(ast) : self