Format a text list of email addresses for an AWS JSON IAM Policy using PowerShell

$content = [System.IO.File]::ReadAllText(".\email.txt")
$content = $content.Trim()
[System.IO.File]::WriteAllText(".\email.txt", $content)

function Show-Menu
{
    param (
        [string]$Title = 'My Menu'
    )
    Clear-Host
    Write-Host "================ $Title ================"
    
    Write-Host "1: Press '1' To create a AmazonSesContosoDev policy."
    Write-Host "2: Press '2' To create a AmazonSesContosoTest policy."
    Write-Host "Q: Press 'Q' to quit."
}

Show-Menu –Title 'My Menu'
$selection = Read-Host "Please make a selection"
switch ($selection)
{
     '1' {
         'You chose option #1'
$inputFile = Get-Content ".\email.txt"

$collate = foreach($Obj in $inputFile) {       
    $begin = '"'
    $end = '",'
    $begin + $Obj + $end

    }

$outputFile = ".\email.txt"

Set-Content -path $outputFile -value $collate

$text = Get-Content -Path ".\email.txt"
$lastLine = $text.Count - 1
$text[$lastLine] = $text[$lastLine] -replace ",",""
Set-Content -Value $text -Path .\email.txt -Encoding Ascii

$content = [System.IO.File]::ReadAllText(".\email.txt")
$content = $content.Trim()
[System.IO.File]::WriteAllText(".\email.txt", $content)

$policy1 = @"

`n{`n
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AmazonSesContosoDev",
            "Effect": "Allow",
            "Action": "ses:SendRawEmail",
            "Resource": "*",
            "Condition": {
                "StringLike": {
                    "ses:FromAddress": [
"@

$policy2 = @"
                   `n]`n
                }
            }
        }
    ]
}
"@


function Insert-Content {
param ( [String]$Path )
process {
$( ,$_; Get-Content $Path -ea SilentlyContinue) | Out-File $Path
}
}

$policy1 | Insert-Content .\email.txt

Add-Content -value $policy2 -path .\email.txt

$content = [System.IO.File]::ReadAllText(".\email.txt")
$content = $content.Trim()
[System.IO.File]::WriteAllText(".\email.txt", $content)

     } '2' {
         'You chose option #2'
$inputFile = Get-Content ".\email.txt"

$collate = foreach($Obj in $inputFile) {       
    $begin = '"'
    $end = '",'
    $begin + $Obj + $end

    }

$outputFile = ".\email.txt"

Set-Content -path $outputFile -value $collate

$text = Get-Content -Path ".\email.txt"
$lastLine = $text.Count - 1
$text[$lastLine] = $text[$lastLine] -replace ",",""
Set-Content -Value $text -Path .\email.txt -Encoding Ascii

$content = [System.IO.File]::ReadAllText(".\email.txt")
$content = $content.Trim()
[System.IO.File]::WriteAllText(".\email.txt", $content)

$policy1 = @"

`n{`n
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AmazonSesContosoTest",
            "Effect": "Allow",
            "Action": "ses:SendRawEmail",
            "Resource": "*",
            "Condition": {
                "StringLike": {
                    "ses:FromAddress": [
"@

$policy2 = @"
                   `n]`n
                }
            }
        }
    ]
}
"@


function Insert-Content {
param ( [String]$Path )
process {
$( ,$_; Get-Content $Path -ea SilentlyContinue) | Out-File $Path
}
}

$policy1 | Insert-Content .\email.txt

Add-Content -value $policy2 -path .\email.txt

$content = [System.IO.File]::ReadAllText(".\email.txt")
$content = $content.Trim()
[System.IO.File]::WriteAllText(".\email.txt", $content)
     } '3' {
         'You chose option #3'
     } 'q' {
         return
     }
}