Fixed bug where no parameter function calls were not typechecked and function/struct name collision. Improved regex library to where it can do straight-line regexs

tests/test_regex.krak

@@ -2,8 +2,8 @@ import io:*
 import regex:*
 
 fun main():int {
-    var reg = regex("a")
-    println(reg.regexString)
-    println(reg.long_match("a"))
+    var reg = regex("ab")
+    println(reg.long_match("abab"))
+    println(reg.long_match("aab"))
     return 0
 }