diff --git a/src/tolower.🗿 b/src/tolower.🗿
new file mode 100644
index 0000000..c51a316
--- /dev/null
+++ b/src/tolower.🗿
@@ -0,0 +1 @@
+tolower(c) return c + 32 * (c >= 'A' & c <= 'Z');
diff --git a/src/toupper.🗿 b/src/toupper.🗿
new file mode 100644
index 0000000..0230828
--- /dev/null
+++ b/src/toupper.🗿
@@ -0,0 +1 @@
+toupper(c) return c - 32 * (c >= 'a' & c <= 'z');