Function sp_io::storage::child_set

pub fn child_set(
    child_storage_key: &[u8], 
    child_definition: &[u8], 
    child_type: u32, 
    key: &[u8], 
    value: &[u8]
)

Set key to value in the child storage denoted by child_storage_key.

See child_get for common child api parameters.