started writing lexer after making string lib

string/docs/modify/lower.md

@@ -0,0 +1,23 @@
+# string_Lower
+Make a string lowercase.
+
+## Arguments
+- str (string): the string to make lowercase.
+
+## Returns
+lowerString (string): the string in lowercase.
+
+## Raises
+- `AllocFail`: raised if Ground failed to allocate memory for the new string.
+
+## Example
+### Ground
+```python
+call !string_Lower "my STRING" &lowerString
+println $lowerString # "my string"
+```
+
+### Solstice
+```c
+puts string_Lower("my STRING") // "my string"
+```