def fetch file_path, method_name, *required_params
      if self.index["#{file_path}"].nil? || self.index["#{file_path}"]["#{method_name}"].nil?
        return nil
      end
      λ_id = self.index["#{file_path}"]["#{method_name}"]['lambda_id']
      return self.cache[λ_id] ||= eval(File.read(".spectro/cache/#{λ_id}.rb"))
    end
def fetch file_path, method_name, *required_params
      if self.index["#{file_path}"].nil? || self.index["#{file_path}"]["#{method_name}"].nil?
        return nil
      end
      λ_id = self.index["#{file_path}"]["#{method_name}"]['lambda_id']
      return self.cache[λ_id] ||= eval(File.read(".spectro/cache/#{λ_id}.rb"))
    end
Fetches and returns the target lambda based on the
 given class, method name and required aprameters.

 @param [String] file_path relative path of the file that requests the lambda
 @param [Symbol] method_name the method name that would be implemented
 @param [<Symbol>] required_params parameters that would be required by the lambda
 @return [Proc] the labda that would be implemented