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Check number of parameters in function solution

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Original file line number	Diff line number	Diff line change
`@@ -289,6 +289,15 @@ def check(self):`
`289`	`289`	`ifnotinspect.isfunction(func):`
`290`	`290`	returndict(message=f"`{self.function_name}` is not a function.")
`291`	`291`
	`292`	`+actual_num_params=len(inspect.signature(func).parameters)`
	`293`	`+needed_num_params=len(inspect.signature(self.solution).parameters)`
	`294`	`+ifactual_num_params!=needed_num_params:`
	`295`	`+returndict(`
	`296`	+message=f"`{self.function_name}` should have "
	`297`	`+f"{needed_num_params} parameter{'s'* (needed_num_params>1)}, but it has "`
	`298`	`+f"{actual_num_params}."`
	`299`	`+ )`
	`300`	`+`
`292`	`301`	`# TODO check that function has correct signature`
`293`	`302`
`294`	`303`	`returncheck_exercise(`

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