fix(guide): simplify directory structure

guide/english/elixir/strings/index.md

@@ -0,0 +1,32 @@
+---
+title: Strings
+---
+## Strings
+
+Strings in Elixir are wrapped with double-quotes, while Character Lists are single-quoted. They are UTF-8 encoded binaries.
+```elixir
+iex> "Hello world!"
+"Hello world!"
+```
+
+String Interpolation is possible in Elixir with an octothorp followed by curly braces.
+```elixir
+iex> variable = "world!"
+"world!"
+iex> "Hello #{variable}"
+"Hello world!"
+```
+
+The String module contains many helpful built in functions based on the Unicode standard.
+```elixir
+iex> example = "string"
+"string"
+iex> String.capitalize(example)
+"String"
+iex> String.duplicate(example, 2)
+"stringstring"
+```
+
+#### More Information:
+* [elixir-lang.org | recursion](https://elixir-lang.org/getting-started/basic-types.html#strings)
+* [hexdocs | Enum](https://hexdocs.pm/elixir/String.html)