Incorrect `pname` properties created by `api` command

### Describe the bug

The `api` command creates incorrect `pname` properties for methods:

```
"qname": "sklearn.gaussian_process.kernels.Exponentiation.__call__.eval_gradient",
"pname": "sklearn/sklearn.gaussian_process.kernels/Exponentiation__call__/eval_gradient",
```

Notice the missing slash in `Exponentiation__call__`.

### To Reproduce

Steps to reproduce the behavior:

1. Run the `api` command:
```sh
cd package_parser
poetry run parse-package api -p sklearn -o out
```
2. Check the `pname` property of methods.

### Expected behavior

This should be created instead:

```
"qname": "sklearn.gaussian_process.kernels.Exponentiation.__call__.eval_gradient",
"pname": "sklearn/sklearn.gaussian_process.kernels/Exponentiation/__call__/eval_gradient",
```

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Incorrect `pname` properties created by `api` command #525

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Incorrect pname properties created by api command #525

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Incorrect `pname` properties created by `api` command #525