snippets and headers as placeholders

exercises/practice/leap/.approaches/case/content.md

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+# Using `case`

exercises/practice/leap/.approaches/case/snippet.txt

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+def leap_year?(year) do
+    case { rem(year, 400), rem(year, 100), rem(year, 4) } do
+        { 0, _, _ } -> true
+        { _, 0, _ } -> false
+        { _, _, 0 } -> true
+        { _, _, _ } -> false
+    end
+end

exercises/practice/leap/.approaches/cond/content.md

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+# Using `cond`

exercises/practice/leap/.approaches/cond/snippet.txt

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+def leap_year?(year) do
+    cond do
+        rem(year, 400) == 0 -> true
+        rem(year, 100) == 0 -> false
+        rem(year, 4) == 0 -> true
+        true -> false
+    end
+end

exercises/practice/leap/.approaches/guards/content.md

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+# Function Guards

exercises/practice/leap/.approaches/guards/snippet.txt

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+def leap_year?(year) when rem(year, 400) == 0, do: true
+def leap_year?(year) when rem(year, 100) == 0, do: false
+def leap_year?(year) when rem(year, 4) == 0, do: true
+def leap_year?(_), do: false

exercises/practice/leap/.approaches/operators/content.md

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+# Boolean Operators

exercises/practice/leap/.approaches/operators/snippet.txt

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+def leap_year?(year) do
+    rem(year, 400) == 0 
+    or (rem(year, 100) != 0) 
+    and rem(year, 4) == 0
+end