UCASE/LCASE syntax is incorrectly imposed

[SASRDCRUZ]

Describe the bug
The interpreter is incorrectly stating that the parameter to UCASE (and presumably LCASE) must be a single letter, either string or char.

The specification states:
UCASE()
Returns the string/character with all characters in upper case. The identifier should be of data type string or
char.

To Reproduce
Steps to reproduce the behavior:
Enter this pseudocode
DECLARE Word : STRING
DECLARE UpperCase : STRING
Word <- "Hello"
UpperCase <- UCASE(Word)
OUTPUT UpperCase

However, you get this error:
[line 4] Runtime error: UCASE() argument should be of type CHAR

Expected behavior
This should evaluate correctly and there should not be an error reported

[Coding-Cactus]

Fixed in #37

I think the spec has changed a bit since this project was originally created, I seem to remember there being UCASE for chars and UPPERCASE for strings but that hadn't been implemented anyway.