refactor: swap strings and modules to be consistant with book.

Closes: #1937

Author: Eveeifyeve

dev/Cargo.toml

@@ -72,20 +72,20 @@ bin = [
   { name = "enums2_sol", path = "../solutions/08_enums/enums2.rs" },
   { name = "enums3", path = "../exercises/08_enums/enums3.rs" },
   { name = "enums3_sol", path = "../solutions/08_enums/enums3.rs" },
-  { name = "strings1", path = "../exercises/09_strings/strings1.rs" },
-  { name = "strings1_sol", path = "../solutions/09_strings/strings1.rs" },
-  { name = "strings2", path = "../exercises/09_strings/strings2.rs" },
-  { name = "strings2_sol", path = "../solutions/09_strings/strings2.rs" },
-  { name = "strings3", path = "../exercises/09_strings/strings3.rs" },
-  { name = "strings3_sol", path = "../solutions/09_strings/strings3.rs" },
-  { name = "strings4", path = "../exercises/09_strings/strings4.rs" },
-  { name = "strings4_sol", path = "../solutions/09_strings/strings4.rs" },
-  { name = "modules1", path = "../exercises/10_modules/modules1.rs" },
-  { name = "modules1_sol", path = "../solutions/10_modules/modules1.rs" },
-  { name = "modules2", path = "../exercises/10_modules/modules2.rs" },
-  { name = "modules2_sol", path = "../solutions/10_modules/modules2.rs" },
-  { name = "modules3", path = "../exercises/10_modules/modules3.rs" },
-  { name = "modules3_sol", path = "../solutions/10_modules/modules3.rs" },
+  { name = "strings1", path = "../exercises/10_strings/strings1.rs" },
+  { name = "strings1_sol", path = "../solutions/10_strings/strings1.rs" },
+  { name = "strings2", path = "../exercises/10_strings/strings2.rs" },
+  { name = "strings2_sol", path = "../solutions/10_strings/strings2.rs" },
+  { name = "strings3", path = "../exercises/10_strings/strings3.rs" },
+  { name = "strings3_sol", path = "../solutions/10_strings/strings3.rs" },
+  { name = "strings4", path = "../exercises/10_strings/strings4.rs" },
+  { name = "strings4_sol", path = "../solutions/10_strings/strings4.rs" },
+  { name = "modules1", path = "../exercises/09_modules/modules1.rs" },
+  { name = "modules1_sol", path = "../solutions/09_modules/modules1.rs" },
+  { name = "modules2", path = "../exercises/09_modules/modules2.rs" },
+  { name = "modules2_sol", path = "../solutions/09_modules/modules2.rs" },
+  { name = "modules3", path = "../exercises/09_modules/modules3.rs" },
+  { name = "modules3_sol", path = "../solutions/09_modules/modules3.rs" },
   { name = "hashmaps1", path = "../exercises/11_hashmaps/hashmaps1.rs" },
   { name = "hashmaps1_sol", path = "../solutions/11_hashmaps/hashmaps1.rs" },
   { name = "hashmaps2", path = "../exercises/11_hashmaps/hashmaps2.rs" },