Add chapters

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diff --git a/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam b/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam
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+++ b/src/content/chapter2_flow_control/lesson03_string_patterns/code.gleam
@@ -0,0 +1,14 @@
+import gleam/io
+
+pub fn main() {
+  io.debug(get_name("Hello, Joe"))
+  io.debug(get_name("Hello, Mike"))
+  io.debug(get_name("System still working?"))
+}
+
+fn get_name(x: String) -> String {
+  case x {
+    "Hello, " <> name -> name
+    _ -> "Unknown"
+  }
+}
diff --git a/src/content/chapter2_flow_control/lesson03_string_patterns/text.html b/src/content/chapter2_flow_control/lesson03_string_patterns/text.html
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+<p>
+  When pattern matching on strings the <code>&lt;&gt;</code> operator can be
+  used to match on strings with a specific prefix.
+</p> 
+<p>
+  The pattern <code>"hello " <> name</code> matches any string that starts with
+  <code>"hello "</code> and asigns the rest of the string to the variable
+  <code>name</code>.
+</p>