Adding new function to fetch available prefixes

Functions/IPAM/Prefix/Get-NetboxIPAMAvailablePrefix.ps1

@@ -0,0 +1,42 @@
+function Get-NetboxIPAMAvailablePrefix {
+    <#
+    .SYNOPSIS
+        A convenience method for returning available prefixes within a prefix
+
+    .DESCRIPTION
+        Will return any available prefixes within a prefix.
+
+    .PARAMETER Prefix_ID
+        A description of the Prefix_ID parameter.
+
+    .PARAMETER Raw
+        A description of the Raw parameter.
+
+    .EXAMPLE
+        Get-NetboxIPAMAvailablePrefix -Prefix_ID (Get-NetboxIPAMPrefix -Prefix 192.0.2.0/24).id
+
+    .NOTES
+        Additional information about the function.
+#>
+
+    [CmdletBinding()]
+    param
+    (
+        [Parameter(Mandatory = $true,
+            ValueFromPipelineByPropertyName = $true)]
+        [Alias('Id')]
+        [uint64]$Prefix_ID,
+
+        [switch]$Raw
+    )
+
+    process {
+        $Segments = [System.Collections.ArrayList]::new(@('ipam', 'prefixes', $Prefix_ID, 'available-prefixes'))
+
+        $URIComponents = BuildURIComponents -URISegments $Segments -ParametersDictionary $PSBoundParameters -SkipParameterByName 'prefix_id'
+
+        $uri = BuildNewURI -Segments $URIComponents.Segments -Parameters $URIComponents.Parameters
+
+        InvokeNetboxRequest -URI $uri -Raw:$Raw
+    }
+}