Remove unnecessary functions from module

smnp/module/string/__init__.py

@@ -1,4 +1,4 @@
-from smnp.module.string.function import concat, stringify
+from smnp.module.string.function import stringify
 
-functions = [ concat.function ]
+functions = []
 methods = [ stringify.function ]

smnp/module/string/function/concat.py

@@ -1,11 +0,0 @@
-from smnp.function.model import Function
-from smnp.function.signature import varargSignature
-from smnp.type.model import Type
-from smnp.type.signature.matcher.type import ofType
-
-_signature = varargSignature(ofType(Type.STRING))
-def _function(env, vararg):
-    return Type.string("".join([ arg.value for arg in vararg ]))
-
-
-function = Function(_signature, _function, 'concat')