Golang Used As Value

Why I am getting an exception function() used as value?

I wrote a program which converts all the letters into capital letters but I am getting an exception called function() used as value here is my code

package main 

import ( "fmt" 

"strings" ) 

func capitalize(name string)

 { name = strings.ToTitle(name) 

return } 

func main() 

{ sample := "hello" 

fmt.Println(capitalize(sample)) }

Can anyone give me the exact solution?