fix: Include exercises folder in the project structure behind a feature (#917)

closes #859
closes #913
closes #942

Author: x-hgg-x

Cargo.toml

@@ -11,7 +11,7 @@ console = "0.7.7"
 notify = "4.0.15"
 toml = "0.4.10"
 regex = "1.1.6"
-serde = {version = "1.0.10", features = ["derive"]}
+serde = { version = "1.0.10", features = ["derive"] }
 
 [[bin]]
 name = "rustlings"
@@ -21,3 +21,6 @@ path = "src/main.rs"
 assert_cmd = "0.11.0"
 predicates = "1.0.1"
 glob = "0.3.0"
+
+[features]
+exercises = []

exercises/advanced_errors/mod.rs

@@ -0,0 +1,2 @@
+mod advanced_errs1;
+mod advanced_errs2;

exercises/clippy/mod.rs

@@ -0,0 +1,2 @@
+mod clippy1;
+mod clippy2;

exercises/collections/mod.rs

@@ -0,0 +1,4 @@
+mod hashmap1;
+mod hashmap2;
+mod vec1;
+mod vec2;

exercises/conversions/mod.rs

@@ -0,0 +1,5 @@
+mod as_ref_mut;
+mod from_into;
+mod from_str;
+mod try_from_into;
+mod using_as;

exercises/enums/mod.rs

@@ -0,0 +1,3 @@
+mod enums1;
+mod enums2;
+mod enums3;

exercises/error_handling/mod.rs

@@ -0,0 +1,6 @@
+mod errors1;
+mod errors2;
+mod errors3;
+mod errors4;
+mod errors5;
+mod errors6;

exercises/functions/mod.rs

@@ -0,0 +1,5 @@
+mod functions1;
+mod functions2;
+mod functions3;
+mod functions4;
+mod functions5;

exercises/generics/mod.rs

@@ -0,0 +1,3 @@
+mod generics1;
+mod generics2;
+mod generics3;

exercises/if/mod.rs

@@ -0,0 +1,2 @@
+mod if1;
+mod if2;