Nested string fields can not be updated using reflection in an arbitrary Go struct

I'm trying to update all string fields in a struct and its subfields using reflection in golang for an arbitrary struct as follows:

package main
import (
    "fmt"
    "reflect"
    "strings"
)

func main() {
    type Inner struct {
	    In1 string
	    In2 []string
    }

    type Type struct {
	    Name  string
	    Names []string
	    NewSt Inner
    }

    a := Type{
	    Name:  " [ (Amir[ ",
	    Names: nil,
	    NewSt: Inner{
		    In1: " [in1",
		    In2: []string{"  [in2( "},
	    },
    }

    trims(&a)
    fmt.Printf("%#v\n", a)
}

func trim(str string) string {
	return strings.TrimSpace(strings.Trim(str, "[](){}, "))
}

func trims(ps interface{}) {
    v := reflect.ValueOf(ps).Elem() // Elem() dereferences pointer
    for i := 0; i < v.NumField(); i++ {
	    fv := v.Field(i)
	    switch fv.Kind() {
	    case reflect.String:
		    fv.SetString(trim(fv.String()))
	    case reflect.Struct:
    		in := fv.Interface()
    		trims(&in)
    	}
    }
}

But I get panic: reflect: call of reflect.Value.Elem on struct Value error.
How can I fix it or is there any better way that I can do such thing??

Thanks.

func trims(ps interface{}) {
	v := reflect.ValueOf(ps)
	if v.Kind() == reflect.Ptr {
		v = v.Elem() // Elem() dereferences pointer
	}
	if v.Kind() != reflect.Struct {
		panic("not struct")
	}
	for i := 0; i < v.NumField(); i++ {
		fv := v.Field(i)
		switch fv.Kind() {
		case reflect.String:
			fv.SetString(trim(fv.String()))
		case reflect.Struct:
            // use Addr() to get an addressable
            // value of the field
			in := fv.Addr().Interface()

            // do not use &in, that evaluates
            // to *interface{}, that's almost
            // NEVER what you want
			trims(in)
        case reflect.Slice:
			if fv.Type().Elem().Kind() == reflect.String {
				for i := 0; i < fv.Len(); i++ {
					fv.Index(i).SetString(trim(fv.Index(i).String()))
				}
			}
		}
	}
}

https://go.dev/play/p/JkJTJzTckNA