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519 B

package solutions
// applies a function in argument to each element of the linked list
func ListForEach(l *List, f func(*NodeL)) {
it := l.Head
for it != nil {
f(it)
it = it.Next
}
}
func Add2_node(node *NodeL) {
switch node.Data.(type) {
case int:
node.Data = node.Data.(int) + 2
case string:
node.Data = node.Data.(string) + "2"
}
}
func Subtract3_node(node *NodeL) {
switch node.Data.(type) {
case int:
node.Data = node.Data.(int) - 3
case string:
node.Data = node.Data.(string) + "-3"
}
}